List of ThunderCats (1985 TV series) episodes facts for kids

Kids Encyclopedia Facts

ThunderCats is an American animated cartoon show made by Rankin/Bass Productions. It's about a group of cat-like humanoids who leave their dying planet, Thundera, and crash-land on a new world called Third Earth. They become heroes, fighting against evil forces like Mumm-Ra and the Mutants.

The first season had 65 episodes. This was a common number for animated shows back then, as it meant they could be shown every weekday for about three months. In 1986, a TV movie called ThunderCats - Ho! was released. It was later split into five episodes and added to the reruns of Season 1. The second season had 60 episodes and was shown as three smaller seasons between 1987 and 1989. Each of these smaller seasons started with a five-part story that introduced new ideas and characters.

You can find the whole series on DVD in two box-sets. The first part of Season 1 had a small problem: one episode was missing its background music. A corrected version was later released. The episodes on DVD are in the order they were first shown on TV. However, this order isn't always the best for following the story. Sometimes, events or characters appear out of order. This mostly happens in the second half of Season 1, especially with the "Lion-O's Anointment" mini-series, which was originally spread out instead of being shown on consecutive days. When the show was re-aired on Cartoon Network years later, they tried to show the episodes in a more correct story order.

All the ThunderCats Adventures
Season 1 (1985)
Season 2 (1986)
Season 3 (1987)
Season 4 (1988)
See also

All the ThunderCats Adventures

Season	Episodes	Originally aired
Season	Episodes	First aired	Last aired
1	65	September 9, 1985 (1985-09-09)	December 20, 1985 (1985-12-20)
2	25	September 8, 1986 (1986-09-08)	October 10, 1986 (1986-10-10)
3	20	September 7, 1987 (1987-09-07)	October 2, 1987 (1987-10-02)
4	20	September 5, 1988 (1988-09-05)	September 29, 1988 (1988-09-29)

Season 1 (1985)

Episode Number	Season Number	Title	Written by	First Air Date	Production Order	CN Order
1	1	"Exodus (Pilot: Part One)"	Leonard Starr	September 9, 1985 (1985-09-09)	1	1
The ThunderCats must find a new home after their planet, Thundera, explodes. Their journey is attacked by the evil Mutants. Jaga guides the ship to Third Earth. Lion-O, who looks like an adult but is still a boy inside, must learn to be the leader.
2	2	"The Unholy Alliance (Pilot: Part Two)"	Leonard Starr	September 10, 1985 (1985-09-10)	2	2
The Mutants' ship crashes near a black pyramid, home of Mumm-Ra, an evil sorcerer. Mumm-Ra teams up with the Mutants to get the Eye of Thundera. Lion-O faces his first big enemy.
3	3	"Berbils"	Leonard Starr	September 11, 1985 (1985-09-11)	3	3
Panthro shows off the ThunderTank, saving everyone from Mumm-Ra's meteor shower. Lion-O and Snarf are captured by small robot bears called Berbils. They learn the Berbils are attacked by Trolligs, who steal their fruit for the Giantorrs.
4	4	"The Slaves of Castle Plun-darr"	Leonard Starr	September 12, 1985 (1985-09-12)	4	4
The ThunderCats' home, Cats' Lair, is almost done. Wilykit and Wilykat report that the Mutants are forcing Brute-Men to build their new fortress, Castle Plun-darr. The adult ThunderCats go to free the Brute-Men.
5	5	"Pumm-Ra"	Jules Bass	September 13, 1985 (1985-09-13)	5	6
Mumm-Ra pretends to be a Thunderian named Pumm-Ra. He claims to have saved Cheetara from the Mutants to sneak into the completed Cats' Lair.
6	6	"The Terror of Hammerhand"	Ron Goulart and Jules Bass	September 16, 1985 (1985-09-16)	6	7
Snarf is caught after freeing a unicorn from the pirate Hammerhand and his Berserkers. Lion-O meets the Unicorn Keepers and then goes to rescue Snarf.
7	7	"Trouble with Time"	Ron Goulart and Jules Bass	September 17, 1985 (1985-09-17)	7	5
The Mutants want to capture Third Earth natives. Willa, a Warrior Maiden, fights off Monkian. Lion-O takes the ThunderTank for a ride. Tygra looks for Thundrylium in a cave and starts to age very quickly.
8	8	"The Tower of Traps"	Leonard Starr	September 18, 1985 (1985-09-18)	8	8
Wilykit and Wilykat meet a Wolo and search for stolen jewelry. Wilykat gets trapped in a tower. Lion-O and Wilykit must go through a maze of booby traps set by Baron Karnor to save him.
9	9	"The Garden of Delights"	Barney Cohen and Jules Bass	September 19, 1985 (1985-09-19)	9	9
Tygra chases a giant worm and finds the Molemen. He then meets Mumm-Ra, disguised as a flower. Tygra is forced to steal the Sword of Omens. Mumm-Ra and the Mutants capture Willa to use the Sword against the ThunderCats.
10	10	"Mandora - The Evil Chaser"	William Overgard	September 20, 1985 (1985-09-20)	10	10
Lion-O opens a spaceship's escape pod and accidentally releases galactic criminals. Mandora the Evil Chaser arrives, and Lion-O helps her try to catch them.
11	11	"The Ghost Warrior"	Leonard Starr	September 23, 1985 (1985-09-23)	11	11
Two Bolkins accidentally release the ghost of the evil Grune the Destroyer from an ancient tomb. Grune knows Jaga from a long time ago. The Bolkins, Wolos, and Berbils ask the ThunderCats for help against this powerful enemy.
12	12	"The Doomgaze"	Stephen Perry	September 24, 1985 (1985-09-24)	12	12
Mumm-Ra teams up with an old priestess who can hypnotize men with her stare.
13	13	"Lord of the Snows"	Bob Haney	September 25, 1985 (1985-09-25)	13	13
A meteor of pure Thundrylium crashes into Hook Mountain. Lion-O goes after it and meets a mountain man he must fight. This is also the first time Vultureman appears.
14	14	"The Spaceship beneath the Sands"	Leonard Starr	September 26, 1985 (1985-09-26)	14	14
After losing many times, the Mutants ask Mumm-Ra to bring back their ship, which he buried in the desert. Once it's back, they have new weapons to use against the ThunderCats.
15	15	"The Time Capsule"	Peter Lawrence	September 27, 1985 (1985-09-27)	15	15
The ThunderCats decide to look for their time capsule from Thundera, which has been missing since they crashed on Third Earth.
16	16	"The Fireballs of Plun-Darr"	William Overgard	September 30, 1985 (1985-09-30)	16	16
The Tree Top Kingdom is attacked by fireballs from a new weapon at Castle Plun-darr. Tygra investigates and is captured. Lion-O and Willa must rescue Tygra and destroy the weapon.
17	17	"All That Glitters"	Bob Haney	October 1, 1985 (1985-10-01)	17	17
Mumm-Ra tricks Lion-O and Tygra into fighting, which breaks the Sword of Omens. To fix it, the ThunderCats need help from a being who gets power from bathing in liquid gold.
18	18	"Spitting Image"	Howard Post	October 2, 1985 (1985-10-02)	18	18
After Driller captures Panthro, Mumm-Ra makes an evil copy of Panthro. He wants to turn the people of Third Earth against the ThunderCats.
19	19	"Mongor"	Peter Lawrence	October 3, 1985 (1985-10-03)	19	24
While exploring, the ThunderKittens find an old temple. Their curiosity releases a demon, a goat-like creature that gets stronger when others fear him. The ThunderCats must overcome their fears to defeat this monster.
20	20	"Return to Thundera"	Bob Haney	October 4, 1985 (1985-10-04)	20	25
The Mutants unleash a new, unbeatable war robot. Lion-O accidentally travels back in time to Thundera through the Time Capsule's hologram. He meets his father, Claudius, who gives him a secret about the War Robot.
21	21	"Dr. Dometone"	William Overgard	October 7, 1985 (1985-10-07)	21	33
A frog robot swallows Wilykit. It's controlled by Dr. Dometome, a scientist who keeps the ocean from draining into the Earth's core.
22	22	"The Astral Prison"	Peter Lawrence	October 8, 1985 (1985-10-08)	22	34
Jaga is trapped in the Astral World. Lion-O must go there to free him, but there's no way for him to come back.
23	23	"The Crystal Queen"	Leonard Starr	October 9, 1985 (1985-10-09)	23	28
A rare and beautiful bird is captured by the queen of a crystal kingdom.
24	24	"Safari Joe"	Stephen Perry	October 10, 1985 (1985-10-10)	24	29
Safari Joe comes to Third Earth looking for worthy prey. He starts hunting the ThunderCats.
25	25	"Snarf Takes up the Challenge"	Peter Lawrence	October 11, 1985 (1985-10-11)	25	26
After the ThunderCats are captured by Mumm-Ra, it's up to Snarf to save them.
26	26	"Sixth Sense"	Peter Lawrence	October 28, 1985 (1985-10-28)	26	32
A ship in trouble tries to ask the ThunderCats for help using Cheetara's sixth sense. It takes control of Cheetara, putting her in danger when the Mutants attack.
27	27	"The Thunder-Cutter"	William Overgard	October 29, 1985 (1985-10-29)	27	38
Lion-O meets Hachiman, a samurai who uses a sword called the Thunder-Cutter.
28	28	"The Wolfrat"	Chris Trengove	October 30, 1985 (1985-10-30)	28	46
Vultureman builds a robot called the Wolfrat. It uses a gas to shrink the ThunderCats to nine inches tall. They must rely on a normal-sized Snarf to help them defeat the robot.
29	29	"Feliner - Part One"	Stephen Perry	October 31, 1985 (1985-10-31)	29	41
Vultureman calls the Mutant warlord, Ratar-O, who kidnaps Snarf's nephew, Snarfer, from the planet of Snarfs. They bring Snarfer to Third Earth to use him as bait to trap the ThunderCats.
30	30	"Feliner - Part Two"	Stephen Perry	November 1, 1985 (1985-11-01)	30	42
The ThunderCats race to get a part for their ship, the Feliner, from the crashed Rat Star before the Mutants fix it. Snarf thinks about leaving the ThunderCats forever.
31	31	"Mandora and the Pirates"	William Overgard	November 4, 1985 (1985-11-04)	31	27
Mandora inspects a space freighter, which turns out to be the old pirate ship The Jolly Rogers. She needs Lion-O's help.
32	32	"Return of the Driller"	Howard Post	November 5, 1985 (1985-11-05)	32	30
Mumm-Ra tells the Driller to dig a tunnel from the Acid Lake to Cats' Lair. It's a race to save the Lair as they face many dangers trying to get a sponge cloud to fill the hole.
33	33	"Dimension Doom"	Bob Haney	November 6, 1985 (1985-11-06)	33	36
Wizz-Ra returns from another dimension every seven thousand years. This time, he enters Cats' Lair through a mirror. Mumm-Ra, his old enemy, steals his magic helmet. Mumm-Ra then enslaves the ThunderCats. Only Cheetara and Snarf can help their new friend before time runs out.
34	34	"Queen of 8 Legs"	Stephen Perry	November 7, 1985 (1985-11-07)	34	35
Mumm-Ra disguises himself as a diamond fly and lures Lion-O into Spidera's Kingdom of Webs.
35	35	"Sword in a Hole"	William Overgard	November 8, 1985 (1985-11-08)	35	45
The ThunderCats answer a space liner's distress call, only to be captured by mercenaries hired by Mumm-Ra. The Sword of Omens is thrown into a black hole.
36	36	"The Evil Harp of Charr-Nin"	Douglas Bernstein and Denis Markell	November 11, 1985 (1985-11-11)	36	51
Wilykit and Wilykat find a magic harp with a genie inside. Mumm-Ra offers to free the genie if he helps destroy the ThunderCats.
37	37	"Lion-O's Anointment First Day: The Trial of Strength"	Leonard Starr	November 12, 1985 (1985-11-12)	37	19
Snarf tells Lion-O he must earn his title as Lord of the ThunderCats by completing five trials. The first trial is to defeat the strong Panthro.
38	38	"The Demolisher"	Bob Haney and Peter Lawrence	November 13, 1985 (1985-11-13)	38	40
A bored space conqueror comes to Third Earth to fight Mumm-Ra. After beating Mumm-Ra, he hears about the ThunderCats' power and goes to fight Lion-O.
39	39	"Monkian's Bargain"	Lee Schneider	November 14, 1985 (1985-11-14)	39	53
Monkian makes a deal with Mumm-Ra to get power orbs, no matter the cost.
40	40	"Tight Squeeze"	Stephen Perry	November 15, 1985 (1985-11-15)	40	52
After an argument, Vultureman leaves Castle Plun-darr and destroys all the Mutants' technology. Slithe has to ask Mumm-Ra to take away the ThunderCats' weapons, which he seals away.
41	41	"The Micrits"	Bruce Smith	November 18, 1985 (1985-11-18)	41	49
Lion-O is captured by tiny creatures who see him as a threat. They disable Cats' Lair and the ThunderTank. The Mutants use this chance to attack the other ThunderCats, who don't know where Lion-O is.
42	42	"Lion-O's Anointment Second Day: The Trial of Speed"	Leonard Starr	November 19, 1985 (1985-11-19)	42	20
Lion-O must beat Cheetara in a race to pass the second anointment trial.
43	43	"The Rock Giant"	Peter Lawrence	November 20, 1985 (1985-11-20)	43	37
Mumm-Ra wakes up a monster made of rocks to defeat the ThunderCats.
44	44	"Jackalman's Rebellion"	Bruce Smith	November 21, 1985 (1985-11-21)	44	55
Jackalman creates his own army and steals weapons from the Mutants.
45	45	"Turmagar the Tuska"	C.H. Trengove	November 22, 1985 (1985-11-22)	45	31
A strange traveler crashes near Cats' Lair and asks the ThunderCats for help fighting a war machine.
46	46	"Lion-O's Anointment Third Day: The Trial of Cunning"	Leonard Starr	November 25, 1985 (1985-11-25)	46	21
Lion-O must outsmart Wilykit and Wilykat in the Maze of Infinity. But other dangers are lurking there too.
47	47	"The Mumm-Ra Berbil"	Jeri Craden	November 26, 1985 (1985-11-26)	47	58
Mumm-Ra disguises himself as an injured Berbil to sneak into Cats' Lair.
48	48	"Mechanical Plague"	Peter Lawrence	November 27, 1985 (1985-11-27)	48	39
Mumm-Ra takes advantage of the ThunderCats being separated. He brings mechanical robots to life to help him destroy the ThunderCats.
49	49	"Trapped"	Stephen Perry	November 28, 1985 (1985-11-28)	49	61
Wilykit and Wilykat get trapped inside an old Suspension Capsule during a storm. Things get worse when the Mutants find out.
50	50	"Lion-O's Anointment Fourth Day: The Trial of Mind Power"	Leonard Starr	November 29, 1985 (1985-11-29)	50	22
Lion-O must overcome Tygra's mental powers and face his biggest fear.
51	51	"Excalibur"	Peter Lawrence	December 2, 1985 (1985-12-02)	51	43
Mumm-Ra pretends to be King Arthur to get Excalibur, the most powerful sword ever.
52	52	"Secret of the Ice King"	Bob Haney	December 3, 1985 (1985-12-03)	52	44
An Ice King, frozen for a thousand years, wakes up and causes trouble on Hook Mountain.
53	53	"Good and Ugly"	Peter Lawrence	December 4, 1985 (1985-12-04)	53	47
Two aliens arrive in spaceships and fight near Cats' Lair. Lion-O learns a lesson about first impressions.
54	54	"The Transfer"	Lawrence DuKore and Lee Schneider	December 5, 1985 (1985-12-05)	54	62
An unknown ship with a dangerous radioactive device comes close to Third Earth.
55	55	"Divide and Conquer"	Lee Schneider	December 6, 1985 (1985-12-06)	55	48
Vultureman creates a voice imitator. The Mutants use it to trick the ThunderCats into splitting up so they can trap and destroy them.
56	56	"Dream Master"	Heather Winters and Annabelle Gurwitch	December 9, 1985 (1985-12-09)	56	64
Mumm-Ra becomes the Dream Master to control the ThunderCats' dreams.
57	57	"Out of Sight"	C.H. Trengove	December 10, 1985 (1985-12-10)	57	54
Willa is captured by the Mutants. Tygra and Nayda make themselves invisible to sneak into Castle Plun-darr, not knowing the risks.
58	58	"The Mountain"	Danny Peary	December 11, 1985 (1985-12-11)	58	56
Lion-O climbs an unknown mountain out of boredom. The Mutants decide to attack, putting everyone in danger.
59	59	"The Superpower Potion"	C.H. Trengove	December 12, 1985 (1985-12-12)	59	50
Vultureman wants to defeat the ThunderCats and rule Third Earth. He decides to make a potion that gives him superpowers.
60	60	"Eye of the Beholder"	Kenneth E. Vose	December 13, 1985 (1985-12-13)	60	57
The ThunderCats create a fake Sword of Omens to trick the Mutants. The plan goes wrong when Snarf is captured.
61	61	"Lion-O's Anointment Final Day: The Trial of Evil"	Leonard Starr	December 16, 1985 (1985-12-16)	61	23
Lion-O must defeat his greatest enemy, Mumm-Ra, to finish his trials.
62	62	"The Trouble with ThunderKittens"	Kimberly B. Morris	December 17, 1985 (1985-12-17)	62	59
Wilykit and Wilykat want to prove they are old enough for adult weapons. They sneak off with the other ThunderCats' weapons to practice. The Mutants take their chance, and the kids escape, but the weapons are now with the Mutants. The kids must tell Lion-O what they did to get his help.
63	63	"Mumm-Rana"	Bob Haney	December 18, 1985 (1985-12-18)	63	60
After a space battle, the Mutants' escape pods land near a white pyramid. Inside, they meet Mumm-Rana, a good version of Mumm-Ra. Mumm-Ra arrives and controls her mind, hoping to use her power against the ThunderCats.
64	64	"The Shifter"	Matthew Malach	December 19, 1985 (1985-12-19)	64	63
Vultureman builds a device that swaps the minds of two beings. He aims it at the ThunderCats.
65	65	"Fond Memories"	Lee Schneider	December 20, 1985 (1985-12-20)	65	65
Mumm-Ra pretends to be Dr. Dometone. He tries to lure Lion-O into a living museum of the ThunderCats' toughest enemies.

Season 2 (1986)

ThunderCats Ho! was first shown as a TV movie.

Episode Number	Season Number	Title	Written by	First Air Date	Production Order	CN Order
66	1	"ThunderCats - Ho! Part One"	Leonard Starr	September 8, 1986 (1986-09-08)	66	66
Lion-O has nightmares about Thunderians dying on Thundera. Jaga tells him that some survived and are on Third Earth. The ThunderCats decide to find them, but Mumm-Ra has other plans.
67	2	"ThunderCats - Ho! Part Two"	Leonard Starr	September 9, 1986 (1986-09-09)	67	67
Lion-O's rescue attempt fails. The captured Thunderians are taken to Fire Rock Mountain after they try to escape.
68	3	"ThunderCats - Ho! Part Three"	Leonard Starr	September 10, 1986 (1986-09-10)	68	68
Lion-O loses the Sword of Omens in an avalanche. Panthro fights the Fist-Pounder with the ThunderTank. The Mutants arrive at Fire Rock Mountain to take control of the prisoners.
69	4	"ThunderCats - Ho! Part Four"	Leonard Starr	September 11, 1986 (1986-09-11)	69	69
The Thunderians try to escape their prison. Lion-O arrives at Fire Rock Mountain and faces Hachiman, who thinks Lion-O is causing his ancestor's suffering.
70	5	"ThunderCats - Ho! Part Five"	Leonard Starr	September 12, 1986 (1986-09-12)	70	70
Lion-O and Hachiman become friends. The ThunderCats get closer to rescuing the Thunderians from Fire Rock Mountain. They need special help to get through the Thundranium gases.
71	6	"Mumm-Ra Lives! Part I"	Leonard Starr	September 15, 1986 (1986-09-15)	71	71
Mumm-Ra is weak and faces three new ThunderCats. He sends the Mutants to free his old enemies, the Lunatacs, from Dark Side to make his evil forces stronger. The ThunderCats celebrate their victory and welcome the new members, but Snarf overhears Mutant plans.
72	7	"Mumm-Ra Lives! Part II"	Leonard Starr	September 16, 1986 (1986-09-16)	72	72
The Mutants free the Lunatacs. The ThunderCats find their Thundrylium mine is being robbed, and people are being kidnapped. Lion-O and the ThunderKittens meet a Lunatac for the first time. Bengali's skills as a blacksmith are very useful.
73	8	"Mumm-Ra Lives! Part III"	Leonard Starr	September 17, 1986 (1986-09-17)	73	73
The ThunderCats build the Tower of Omens for the new ThunderCats to watch for Sky Tomb. Ma-Mutt, disguised as a Berbil, spies on their plans, and the Lunatacs are sent to destroy the Tower. Snarfer contacts Snarf, saying he's returning to Third Earth.
74	9	"Mumm-Ra Lives! Part IV"	Leonard Starr	September 18, 1986 (1986-09-18)	74	74
Mumm-Ra gets his power back. Snarfer reaches Third Earth but crashes in Dark Side. The ThunderCats rush to help him before the Lunatacs can get him.
75	10	"Mumm-Ra Lives! Part V"	Leonard Starr	September 19, 1986 (1986-09-19)	75	75
The ThunderCats search for Sky Tomb to free the slaves. Bengali learns how important teamwork is when Lion-O leaves him on guard duty. Lynx-O and Cheetara scout to see if Mumm-Ra is truly back.
76	11	"Catfight"	Chris Trengove	September 22, 1986 (1986-09-22)	76	76
Mumm-Ra pretends to be Jaga. He tricks Lion-O into thinking the new ThunderCats are traitors, making them fight each other.
77	12	"Psych Out!"	Sandy Fries	September 23, 1986 (1986-09-23)	77	77
Mumm-Ra tells Alluro where to find a special charm that makes the user almost unbeatable. Snarf learns that real courage comes from inside.
78	13	"The Mask of Gorgon"	Romeo Muller	September 24, 1986 (1986-09-24)	78	78
Ma-Mutt digs up an old book. This leads Mumm-Ra to search for the ancient evil Mask of Gorgon.
79	14	"The Mad Bubbler"	Kimberly Morris	September 25, 1986 (1986-09-25)	79	79
The Lunatacs look for Thundrylium in a cave on Hook Mountain. A strange creature drives them crazy, making them fight each other.
80	15	"Together We Stand"	Herb Engelhardt	September 26, 1986 (1986-09-26)	80	80
Mumm-Ra covers the Bezerker's weapons and armor with Thundranium. Wilykit and Wilykat find that guarding Cats' Lair isn't always easy.
81	16	"Ravage Island"	George Hampton and Mike Moore	September 29, 1986 (1986-09-29)	81	81
Mumm-Ra turns on a mesmerizing signal on Ravage Island. It draws the ThunderCats to it and takes control of their minds.
82	17	"Time Switch"	Sandy Fries	September 30, 1986 (1986-09-30)	82	82
Lion-O is exposed to harmful gases from a dangerous Suspension Capsule near Cats' Lair. This makes him grow younger. If the ThunderCats don't find a cure, he will disappear.
83	18	"The Sound Stones"	J. Larry Carroll	October 1, 1986 (1986-10-01)	83	83
Vultureman builds a sonic gun from a sound stone he stole in Dark Side. The Lunatacs join him to attack the Tower of Omens.
84	19	"Day of the Eclipse"	Kimberly Morris	October 2, 1986 (1986-10-02)	84	84
It's the day of a rare total eclipse. Any spell Mumm-Ra casts will last until the next eclipse. He declares a "Day of Decay" on Cats' Lair, making it fall apart.
85	20	"Sideswipe"	William Overgard	October 3, 1986 (1986-10-03)	85	85
Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens. When Mandora gets involved, Chilla freezes her. Chilla becomes a criminal, and Mandora tries to catch her.
86	21	"Mumm-Rana's Belt"	James Rose	October 6, 1986 (1986-10-06)	86	86
Luna finds out her grandmother's magic belt is now with Mumm-Rana, who took it after a battle. Luna goes to the white pyramid, with Pumyra following close behind.
87	22	"Hachiman's Honor"	J. Larry Carroll	October 7, 1986 (1986-10-07)	87	87
While Hachiman is going to the Tower of Omens, Luna steals his sword, the ThunderCutter, and gives it to a robot. Lion-O and the ThunderKittens go to find their old friend.
88	23	"Runaways"	Bill Ratter	October 8, 1986 (1986-10-08)	88	88
Wilykat convinces his twin to run away from home because they feel useless. Living on their own is more dangerous than they thought. The other ThunderCats search for them, and everyone learns about good communication.
89	24	"Hair of the Dog"	Chris Trengove	October 9, 1986 (1986-10-09)	89	89
While all ThunderCats except Lion-O are away, Mumm-Ra swaps Ma-Mutt with Snarf. Ma-Mutt poisons Lion-O, allowing Mumm-Ra to attack.
90	25	"Vultureman's Revenge"	Herb Engelhardt	October 10, 1986 (1986-10-10)	90	90
Vultureman builds a Thundranium projector that creates strong Thundranium areas. When the ThunderKittens damage it, he damages their spaceboard, sending them into danger. Lion-O and Snarf search for them while Vultureman plans his revenge.

Season 3 (1987)

Episode Number	Season Number	Title	Written by	First Air Date	Production Order	CN Order
91	1	"ThunderCubs Part I"	Peter Lawrence	September 7, 1987 (1987-09-07)	91	91
Mumm-Ra learns about the treasure of Thundera and the Sword of Plun-darr that destroyed Thundera. He creates a new Thundera and travels there while the ThunderCats try to find him.
92	2	"ThunderCubs Part II"	Peter Lawrence	September 8, 1987 (1987-09-08)	92	92
After being rescued, the ThunderKittens share what they saw on New Thundera. Vultureman fixes The Rat Star to ambush the ThunderCats on their way to New Thundera.
93	3	"ThunderCubs Part III"	Peter Lawrence	September 9, 1987 (1987-09-09)	93	93
Mumm-Ra claims the Sword of Plun-darr and gets close to the treasure of Thundera. The ThunderCats land on New Thundera.
94	4	"ThunderCubs Part IV"	Peter Lawrence	September 10, 1987 (1987-09-10)	94	94
The Mutants arrive, and Mumm-Ra has them hide a fake Book of Omens, sending the ThunderCats in the wrong direction.
95	5	"ThunderCubs Part V"	Peter Lawrence	September 11, 1987 (1987-09-11)	95	95
The ThunderCubs return to Third Earth and team up with the ThunderKittens for a rescue mission to sneak into Sky Tomb while Lion-O keeps fighting Mumm-Ra.
96	6	"Totem of Dera"	J. Larry Carroll	September 14, 1987 (1987-09-14)	96	96
Mumm-Ra finds the Totem of Dera and learns it can bring lifeless objects to life. He sends the Mutants to use it against the ThunderCats.
97	7	"Chain of Loyalty"	Bill Ratter and Peter Lawrence	September 15, 1987 (1987-09-15)	97	97
Lion-O learns about the Chain of Loyalty from the Book of Omens. Jaga tells him to get it from New Thundera. When Mumm-Ra breaks the chain, the ThunderCats turn against each other, and Lion-O must stop them.
98	8	"Crystal Canyon"	Sandy Fries	September 16, 1987 (1987-09-16)	98	98
Tygra finds a powerful stone that slowly takes over his mind. He refuses to listen when Lion-O warns him that the stone is dangerous.
99	9	"The Telepathy Beam"	Kimberly Morris	September 17, 1987 (1987-09-17)	99	99
Vultureman uses a new weapon on Cheetara, overwhelming her sixth sense. He wants to make her lose confidence and distract her from realizing Panthro has been captured and forced to upgrade Sky Tomb.
100	10	"Exile Isle"	William Overgard	September 18, 1987 (1987-09-18)	100	100
The ThunderCats capture the Lunatacs, put them on trial, and send them to a lonely planet. But an old enemy of the ThunderCats is also trapped there. The Lunatacs team up with him to plan their return to Third Earth.
101	11	"Key to Thundera"	Matthew Malach	September 21, 1987 (1987-09-21)	101	101
While trying to understand the Book of Omens, Lion-O accidentally traps himself inside its pages. Mumm-Ra tries to steal the book. Meanwhile, Panthro finds a mysterious key on New Thundera.
102	12	"Return of the ThunderCubs"	J. Larry Carroll	September 22, 1987 (1987-09-22)	102	102
Tygra, Cheetara, and Panthro fall under Mumm-Ra's power on New Thundera. He tries to use Cheetara's sixth sense to find the Treasure of Thundera. To save his friends, Lion-O must convince the Mutants to fly him from Third Earth in The Rat Star.
103	13	"The Formula"	Kimberly Morris	September 23, 1987 (1987-09-23)	103	103
Alluro's new super-fuel for Sky Tomb makes local plants and animals grow huge. Luna orders the Mutants to spray it around Cats' Lair, trapping the ThunderCats in a giant, wild garden.
104	14	"Locket of Lies"	Bill Ratter	September 24, 1987 (1987-09-24)	104	104
Mumm-Ra creates an evil charm that the ThunderCats mistake for a piece of the Treasure of Thundera. It leads them into deep trouble on New Thundera, with no one around to rescue them.
105	15	"Bracelet of Power"	Bill Ratter	September 25, 1987 (1987-09-25)	105	105
The Feliner returns from New Thundera with a mysterious bracelet. When Snarf puts it on, he finds it can make ThunderCats obey him. While he plays with this power, Mumm-Ra plans to steal the bracelet.
106	16	"The Wild Workout"	Becky Hartman	September 28, 1987 (1987-09-28)	106	106
The Lunatacs connect exercise machines to power Sky Tomb's engines. But they are too lazy, so they need ThunderCats to do the hard work. Mumm-Ra plans to trap the ThunderCats in a freezing cave on New Thundera.
107	17	"The Thunderscope"	George Hampton and Mike Moore	September 29, 1987 (1987-09-29)	107	107
Lion-O and Snarf find a mysterious telescope in their old spaceship's wreckage. Mumm-Ra knows it's the Thunderscope, which can find pieces of the Treasure of Thundera. Lion-O must figure out what it does and keep it from Mumm-Ra.
108	18	"The Jade Dragon"	William Overgard	September 30, 1987 (1987-09-30)	108	108
Mumm-Ra discovers the power of one of the Treasure of Thundera pieces. The Jade Dragon can trap people inside it. Lion-O and Cheetara get trapped. Hachiman is their only hope.
109	19	"The Circus Train"	William Overgard	October 1, 1987 (1987-10-01)	109	109
Captain Bragg, a bounty hunter, comes to Third Earth to help the ThunderCats get rid of the Mutants and Lunataks. He tricks Wilykat into joining him. After catching the Mutants, they try to catch the Lunataks. Luna and Amuk escape, free the other Lunataks, trap Bragg, and tie Wilykat to the train.
110	20	"The Last Day"	J. Larry Carroll	October 2, 1987 (1987-10-02)	110	110
The Ancient Spirits of Evil are tired of Mumm-Ra failing. They give him one last chance: destroy the ThunderCats in 24 hours or be banished. He gets huge power and grows to a giant size. Mumm-Ra causes destruction, sends Tygra, Cheetara, and Panthro to limbo, and buries Lion-O alive. He destroys the Tower of Omens and sends the Thunderkittens to limbo. Snarf goes into the Book of Omens to learn how to defeat Mumm-Ra. Jaga and the others in limbo help free Lion-O. Lion-O learns Mumm-Ra only has until sunset. Mumm-Ra fails and is banished from Third Earth.

Season 4 (1988)

Episode Number	Season Number	Title	Written by	First Air Date	Production Order	CN Order
111	1	"Return to Thundera! Part I"	Peter Lawrence	September 5, 1988 (1988-09-05)	111	111
The Ancient Spirits of Evil bring Mumm-Ra and Ma-Mutt back to life. They send them to New Thundera and build Mumm-Ra a new Pyramid. The ThunderCats say goodbye to Third Earth and go to Thundera, leaving Tygra and Pumyra to guard the Tower of Omens and Cats' Lair. The ThunderCats arrive and plan to build a new lair. Mumm-Ra learns that the planet's gravity is controlled by the Gyroscope. He tries to use this to destroy the ThunderCats and trick the Gyroscope's guardian, Jaguara.
112	2	"Return to Thundera! Part II"	Peter Lawrence	September 6, 1988 (1988-09-06)	112	112
More earthquakes happen because the Gyroscope is not working right. Lion-O gets a distress signal from Thunderian refugees. He, Cheetara, and Snarf go to find them. Mumm-Ra brings Grune the Destroyer back to life. Grune finds and fights Lion-O and Cheetara, breaks the Sword of Omens, and chains them up. Snarf gathers the sword pieces for Bengali to fix. Snarf is captured by Char, a thief who wants the Sword.
113	3	"Return to Thundera! Part III"	Peter Lawrence	September 7, 1988 (1988-09-07)	113	113
Lion-O, Panthro, and the ThunderKittens take the Whisker, a new flying vehicle, to the Churning Rocks to rescue the Thunderian refugees. The ThunderCats are captured by Two-Time, a robot with two heads. Two-Time takes them aboard his spaceship, Dome-Down, where he has also captured the refugees. Lion-O defeats Two-Time, and the refugees are freed. Meanwhile, Lynx-O, Cheetara, and Bengali see Mumm-Ra near the Churning Rocks and tell Lion-O. Lion-O, Panthro, and the ThunderKittens go to the Churning Rocks and face Mumm-Ra, who is again disguised as Jaga.
114	4	"Return to Thundera! Part IV"	Peter Lawrence	September 8, 1988 (1988-09-08)	114	114
Mumm-Ra sends Ma-Mutt, disguised as Mandora, to free the Mutants from Captain Bragg's circus train. He sends Bragg and Crowman falling into deep space. Mumm-Ra orders the Mutants to get rid of Tygra and Pumyra. The Mutants attack Snowman on Hook Mountain. Snowmeow gets Pumyra for help, and Tygra contacts the real Mandora to save Bragg and Crowman. Together, they recapture the Mutants. On New Thundera, the earthquakes get worse, and the new Cats' Lair collapses, trapping Snarf. Lion-O uses the sword to contact the other ThunderCats, and they rush to save Snarf.
115	5	"Return to Thundera! Part V"	Peter Lawrence	September 9, 1988 (1988-09-09)	115	115
Another earthquake, caused by Mumm-Ra, ruins the new Cats' Lair construction site. The ThunderCats go to see Jaguara and face Mumm-Ra. Mumm-Ra puts a force-field over the Churning Rocks' entrance. Jaga appears to Lion-O and tells him to use the Eye of Thundera to reach Jaguara and the Gyroscope. Lion-O does so and fights Mumm-Ra, who throws him into a bottomless pit. Lion-O throws his grappling hook to pull himself back up. Lion-O shines the signal, and it goes through the force-field. All the ThunderCats jump through the signal, which takes them through the force-field. They fire all their weapons at Mumm-Ra, defeating him. Before leaving, Mumm-Ra breaks the cord holding the Gyroscope, and it falls. Now, New Thundera is falling apart.
116	6	"Leah"	J. Larry Carroll and David Carren	September 9, 1988 (1988-09-09)	116	116
The Ancient Spirits of Evil give Mumm-Ra the Mirror Wraith, which he disguises as a child's toy. Mumm-Ra stops a Thunderian escape pod with a little girl, Leah. He gives the toy to Leah and leaves. The ThunderCats rescue her, and she goes into New Cats' Lair with the doll.
117	7	"Frogman"	Kimberly Morris	September 13, 1988 (1988-09-13)	117	117
Wilykit and Wilykat are building a well for the New Cats' Lair on New Thundera. The ThunderCats on New Thundera get a distress signal from Thunderian refugees. The ThunderKittens are left alone with Snarf at the New Cats' Lair. Lion-O and Snarfer are building an early warning device. The rest of the ThunderCats search for the refugees in space. When Wilykit and Wilykat hit water, they accidentally release a monster Jaga trapped centuries ago.
118	8	"The Heritage"	Bill Ratter and Peter Lawrence	September 14, 1988 (1988-09-14)	118	118
Exploring New Thundera, Wilykit and Wilykat find a golden orb. They think it's part of their Thunderian history. The Golden Sphere of Seti takes over the ThunderKittens, making them greedy. Mumm-Ra gets the orb, and his powers become four times stronger.
119	9	"Screwloose"	William Overgard	September 15, 1988 (1988-09-15)	119	119
Jaguara can't run New Thundera's Gyroscope alone, so the ThunderCats order a robot to help her. Screw Loose, a robot specializing in gyroscopes, comes to New Thundera. Mumm-Ra messes up Screw Loose's brain, making him destructive. The ThunderCats must help Jaguara control Screw Loose before the planet is destroyed.
120	10	"Malcar"	George Hampton and Mike Moore	September 16, 1988 (1988-09-16)	120	120
Mumm-Ra brings Malcar, an ancient alchemist, back from the dead. Malcar is old and weak, so Mumm-Ra must restore his youth and power. Malcar regains his powers and uses them against the ThunderCats.
121	11	"Helpless Laughter"	Matthew Malach	September 19, 1988 (1988-09-19)	121	121
The Moons of Plun-darr cause a drought on Thundera. Panthro and Snarf look for water. Ezuka, the flying Serpent of Dreary Canal, attacks them, making them fall into the Swamp of the Laughing Lilypads, where they laugh uncontrollably. Ezuka attacks Cats' Lair, still looking for water. Lion-O uses the Sword of Omens to make rain, and he and Bengali melt ice. Mumm-Ra then causes a flood.
122	12	"Cracker's Revenge"	William Overgard	September 20, 1988 (1988-09-20)	122	122
Captain Cracker and his robot parrot Polly land on Way-Out Back. They free the Lunatacs and trap Bragg and Crownan. They plan to attack Third Earth since most ThunderCats are gone. Snarfer and Mandora go to catch Cracker. Bragg uses a fire extinguisher to get into space for help. Mandora finds him, and the three go to Third Earth. Mandora fights Cracker and the Lunatacs but is beaten. She and Snarfer are tied to her cycle and sent towards a mountain. Lion-O, Panthro, and Cheetara arrive. Lion-O saves Mandora and the others. Cracker and the Lunatacs then attack Cats' Lair.
123	13	"The Mossland Monster"	Chris Trengove	September 21, 1988 (1988-09-21)	123	123
Tygra, on his way to New Thundera, takes a shortcut through a meteor shower. His ship is damaged, and he lands in an unknown area called The Moss-Land. The moss there is part of a giant monster. The Moss Monster captures Tygra. Lion-O and Bengali go to save Tygra and fight the monster.
124	14	"Ma-Mutt's Confusion"	Beth Bornstein	September 22, 1988 (1988-09-22)	124	124
Mumm-Ra has a new device, the Babylonian Barbarian Boiler, for Cats' Lair. Ma-Mutt plays around too much, and Mumm-Ra banishes him. Later, the ThunderKittens, Snarf, and Snarfer bring Ma-Mutt back to Cats' Lair. Mumm-Ra fires the Boiler's beam at Cats' Lair, making it melt. Snarfer makes a device so they can understand Ma-Mutt, who tries to tell them about the Boiler. Mumm-Ra sees this and brings Ma-Mutt back to the Pyramid.
125	15	"Shadowmaster"	Dennis J. Woodyard	September 23, 1988 (1988-09-23)	125	125
From the Shadow Realm, the Shadowmaster tells the Ancient Spirits of Evil that he captured Lion-O's father, Claudus, before Thundera exploded. The Shadowmaster shows Lion-O his captured father in a dream and challenges Lion-O to a fight. Lion-O goes to the Shadow Realm through the Book and Sword of Omens. He can fight as long as the Sword is linked to the book. But the Shadowmaster sends a huge bat to steal the Sword. It succeeds, and Lion-O becomes very weak. Mumm-Ra, feeling the Spirits might favor the Shadowmaster, secretly sends Ma-Mutt to steal the sword from the bat and put it back near the book. This helps Lion-O win in the Shadow Realm.
126	16	"Swan Song"	William Overgard	September 26, 1988 (1988-09-26)	126	126
An Ecology Inspector comes to New Thundera to check the New Cats' Lair. His ship uses the SWAN system to guide him. When he arrives, Two-Time ambushes him. Two-Time uses a hologram to make the Inspector's ship crash. When the ThunderCats come to rescue him in the Feliner, Two-Time uses the hologram again. Lion-O flies around the mountain and lands the Feliner. Meanwhile, Two-Time flies to New Cats' Lair in his spaceship, Dome-Down. He picks up the whole Lair and keeps it inside Dome-Down.
127	17	"Touch of Amortus"	Bill Ratter	September 27, 1988 (1988-09-27)	127	127
Mumm-Ra orders Amortus, a being he banished centuries ago, to destroy Lynx-O. Amortus makes Lynx-O crash and touches his face. The spell makes Lynx-O feel like an outcast, so he leaves to join Amortus. Lion-O, Panthro, and Cheetara go after him. In the Land of No Return, Amortus touches Lynx-O again, turning him to stone. He touches the other ThunderCats, and they start turning to stone too. Just as Lion-O is about to turn completely to stone, he calls the Sword, and it frees them.
128	18	"The Zaxx Factor"	Matthew Malach	September 27, 1989 (1989-09-27)	128	128
Vultureman escapes from exile by taking over a bookmobile. He finds a disk with old information about two powerful evil forces on Third Earth: Mumm-Ra and his enemy Zaxx. Vultureman uses this to plan to defeat Mumm-Ra and rule the universe.
129	19	"Well of Doubt"	Dennis J. Woodyard	September 28, 1989 (1989-09-28)	129	129
The ThunderCats use a new Tower signal to guide a Thunderian ship carrying Baron Tass and Mr. Grubber, two tricky Thunderians. Later, Lion-O sends Torr, Baron Tass, and Mr. Grubber to get water. On the way, the Baron stops at the Well of Doubt and takes some water. This water makes a person doubt their own abilities. When they return, Baron Tass gives some water to Lion-O. On the way to check the new Tower in the Whisker, Lion-O feels the water's effects and crashes the Whisker. Tass returns with his Guardsman, giant stone-men, and has them attack the ThunderCats.
130	20	"The Book of Omens"	William Overgard	September 29, 1989 (1989-09-29)	130	130
Finally, Panthro figures out how to use the Key of Omens. He enters the code, and the Guardian of Omens appears. It tells the ThunderCats they have 24 hours to bring the Key and four other items to four troubled places on New Thundera. Everything was going well, but Mumm-Ra stole the Key. Mumm-Ra enters the Book of Omens just as Lion-O finds him, and they battle inside the Book. This was a good ending for the series, even though it left some things open.