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Monster by Mistake
Created by Mark Mayerson please donate to Wikipedia
Voices of
  • Julie Lemieux
  • Hillary Cooper
  • Sally Cahill
  • Tony Rosato
  • Daniel DeSanto
  • Len Carlson
  • Howard Jerome
  • Jayne Eastwood
  • Barbara Franklin
  • Susan Roman
Theme music composer Bruce Fowler
Blair Packham
  • Bruce Fowler
  • Modular Music
Country of origin Canada
No. of seasons 3
No. of episodes 52
Running time 22 minutes
Production company(s) Catapult Productions
Alliance Atlantis Communications
Cambium Entertainment (seasons 1–2)
CCI Entertainment (season 3)
Distributor Cambium Releasing (1996–2002)
CCI Entertainment (2002–13)
9 Story Media Group (2013–present)
Original network YTV
VRAK.TV (season 3)
Original release September 6, 1999 (1999-09-06) – March 23, 2003 (2003-03-23)

Monster By Mistake is a Canadian CGI animated series that aired on YTV from September 6, 1999, to March 23, 2003. The series was created by Mark Mayerson of Catapult Productions and co-produced with CCI Entertainment (formerly Cambium) in Toronto, Canada. The two companies partnered in Studio 345, a computer animation and former Sears catalogue production facility for the production of the show, which was made using Houdini software.

It also aired on HBO Family in the United States and Discovery Kids in Latin America and Brazil.


  • Warren Patterson (voiced by Julie Lemieux in the series and voiced by Corey Sevier in the pilot episode) is the protagonist of the show, who turns into the titular blue monster whenever he sneezes after having been accidentally cursed by Gorgool's jewel.
  • Tracy Patterson (voiced by Hillary Goldhar) is Warren's supportive older sister who practices witchcraft after receiving Gorgool's book.
  • Johnny B. Dead (voiced by William Colgate) is a wise-cracking, trumpet-playing ghost who assists the siblings in their misadventures and secretly lives in the Pattersons' attic.

Recurring characters

  • Roz and Tom Patterson (voiced by Sally Cahill and Tony Rosato) are the parents of Warren and Tracy.
  • Aunt Dolores (voiced by Jayne Eastwood) is Warren and Tracy's aunt, a crabby and stuck-up but serious and well-meaning police officer and the older sister of Tom Patterson. She has a vendetta against the monster, unaware of it being her nephew.
  • Billy Castleman (voiced by Daniel DeSanto) is an overweight, mean school bully who often ridicules Warren. He's hellbent on proving Warren as the monster, but is unable to do so
  • Gorgool (voiced by Len Carlson) is a sorcerer and the would-be ruler of Fenrath, who is trapped in a ball. He intends to steal the Jewel of Fenrath and the Book of Spells with his servant.
  • The Servant (voiced by Howard Jerome) is the dim-witted servant of Gorgool. He carries Gorgool around and follows Gorgool's every command. His real name is never mentioned.
  • Wesley Whiffington III (voiced by Christopher Ralph) is a child who appears in Season Two. He is spoiled and never gets things his way. He is also interested in adult projects such as business and moviemaking.
  • Miranda Bell (voiced by Alyson Court) is a girl who said she became a scientist at age six and says that her brain weighs eight pounds.
  • Morgool (voiced by Len Carlson) is Gorgool's twin brother and the ruler of Fenrath. He is not trapped within a ball and is far more dangerous and evil than his twin. It is believed that Morgool is unable to control anyone who is superior to him, such as the monster, and his jealousy and greed for the throne resulted in Gorgool's confinement to the glass ball.
  • Ms. Gish (voiced by Barbara Franklin) is the teacher who is involved with most episodes in Season One.
  • Kragon (voiced by George Buza) is a guard working for Morgool in Fenrath. He always helps his master in his schemes, mainly trying to capture the monster. Kragon's home region is Gorem Range.
  • Red (voiced by Megan Fahlenbock) is an orphan from Fenrath who becomes friends with Warren and Tracy. She is always up for adventure and kicking bad-guy butt.
  • Freddie Mitchell and Corum (both voiced by Susan Roman) are friends of Warren's. Freddie loves to tell jokes and play soccer. Connor's hobbies include pogo jumping, playing the piano, and video games.
  • Keebo (voiced by Hadley Kay), is a shapeshifting creature from Fenrath.


  • The first episode aired on September 6, 1999, and the last episode aired on March 23, 2003. To date, 52 episodes have been produced in three seasons.

Pilot (1996)

# Title Directed by Written by Original air date
0 "Monster by Mistake (Titled "Jewel of Fenrath" on DVD Release)" Mark Mayerson Mark Mayerson and Kim Davidson October 26, 1996 (1996-10-26)

Season 1 (1999)

# Title Directed by Written by Original air date
1 "Pizza Day" Robert D.M. Smith Deborah Jarvis September 6, 1999 (1999-09-06)
2 "Just Desserts" Mark Mayerson Lawrence S. Mirkin September 13, 1999 (1999-09-13)
3 "Fossel Remains" Harry Rasmussen Deborah Jarvis September 20, 1999 (1999-09-20)
4 "Haunted House" Robert D.M. Smith Anita Kapila September 27, 1999 (1999-09-27)
5 "Monster Mayhem" Mark Mayerson Deborah Jarvis October 4, 1999 (1999-10-04)
6 "Special Talent" Harry Rasmussen Lawrence S. Mirkin October 11, 1999 (1999-10-11)
7 "Campsite Creeper" Robert D.M. Smith Dan Fill October 18, 1999 (1999-10-18)
8 "Home Alone" Mark Mayerson Deborah Jarvis and Anita Kapila October 25, 1999 (1999-10-25)
9 "Entertaining Orville" Harry Rasmussen Cathy Moss November 1, 1999 (1999-11-01)
10 "Kidnapped" Robert D.M. Smith Anita Kapila November 8, 1999 (1999-11-08)
11 "Monster A-Go-Go" Mark Mayerson Deborah Jarvis November 15, 1999 (1999-11-15)
12 "Back in Time" Harry Rasmussen Lawrence S. Mirkin November 22, 1999 (1999-11-22)
13 "Gwynneth" Robert D.M. Smith Deborah Jarvis November 29, 1999 (1999-11-29)

Season 2 (2000)

# Title Directed by Written by Original air date
14 "Billy Caves In" Brian Harris Anita Kapila September 4, 2000 (2000-09-04)
15 "Tracy's Jacket" Robert D.M. Smith Deborah Jarvis September 11, 2000 (2000-09-11)
16 "Live From Pickford" Harry Rasmussen Steve Westren September 18, 2000 (2000-09-18)
17 "Soap Box Derby" Brian Harris Stephen Ashton September 25, 2000 (2000-09-25)
18 "The Big Dig" Robert D.M. Smith Dan Fill October 2, 2000 (2000-10-02)
19 "Thin Ice" Harry Rasmussen Anita Kapila October 9, 2000 (2000-10-09)
20 "Gorgool's Pet" Brian Harris Steve Wright October 16, 2000 (2000-10-16)
21 "Jungleland" Robert D.M. Smith Cathy Moss October 23, 2000 (2000-10-23)
22 "Cops and Monsters" Harry Rasmussen Mark Mayerson October 30, 2000 (2000-10-30)
23 "Johnny's Reunion" Brian Harris Anita Kapila November 6, 2000 (2000-11-06)
24 "Moving Day" Mark Mayerson Mark Mayerson November 13, 2000 (2000-11-13)
25 "Lights! Camera! Monster!" Robert D.M. Smith Deborah Jarvis November 20, 2000 (2000-11-20)

Season 3 (2003)

# Title Directed by Written by Original air date
26 "Warren's Nightmare" Mark Mayerson Mark Mayerson February 26, 2003 (2003-02-26)
27 "Wrestling Challenge" David Geldart Story by : Mark Mayerson
Teleplay by : Steve Westren
February 27, 2003 (2003-02-27)
28 "Monkey in the Middle" Troy Sullivan Nicole Demerse February 28, 2003 (2003-02-28)
29 "Watch the Birdie" Mark Mayerson Mark Mayerson March 1, 2003 (2003-03-01)
30 "Natural Disaster" David Geldart Patrick Granleese March 2, 2003 (2003-03-02)
31 "Donut Dough" Troy Sullivan Steve Westren March 3, 2003 (2003-03-03)
32 "Robo Fuzz" Mark Mayerson Terry Saltsman March 4, 2003 (2003-03-04)
33 "Dino Might" David Geldart Dennise Fordham March 5, 2003 (2003-03-05)
34 "Ghost With the Most" Troy Sullivan Anita Kapila March 6, 2003 (2003-03-06)
35 "Reduce, Re-use, Recycle... Run!" Mark Mayerson Patrick Granleese March 7, 2003 (2003-03-07)
36 "Night of the Living Meat" David Geldart Steve Westren March 8, 2003 (2003-03-08)
37 "Badgering Billy" Troy Sullivan Steve Westren March 9, 2003 (2003-03-09)
38 "Monster on Purpose" Mark Mayerson Patrick Granleese March 10, 2003 (2003-03-10)
39 "Duel for a Jewel" David Geldart Stew Mulligan March 11, 2003 (2003-03-11)
40 "Keebo for Keeps" Mark Mayerson Bruce Robb March 12, 2003 (2003-03-12)
41 "Who's Who" Troy Sullivan Patrick Granleese March 13, 2003 (2003-03-13)
42 "Knight and Day" David Geldart Terry Saltsman March 14, 2003 (2003-03-14)
43 "Sasquashed" Troy Sullivan Dennise Fordham March 15, 2003 (2003-03-15)
44 "Mine Your Own Business" Mark Mayerson Mark Mayerson and Bruce Robb March 16, 2003 (2003-03-16)
45 "Leap Frog" David Geldart Patrick Granleese March 17, 2003 (2003-03-17)
46 "Lucky Break" Troy Sullivan Terry Saltsman March 18, 2003 (2003-03-18)
47 "Worlds Collide" Mark Mayerson Terry Saltsman March 19, 2003 (2003-03-19)
48 "Lights Out" David Geldart Dennise Fordham and Patrick Granleese March 20, 2003 (2003-03-20)
49 "Curse of the Invisible Man" Troy Sullivan Patrick Granleese March 21, 2003 (2003-03-21)
50 "Brotherly Hate" Mark Mayerson Mark Mayerson and Terry Saltsman March 22, 2003 (2003-03-22)
51 "The Death Of Gordon Freeman" David Geldart Steve Westren March 23, 2003 (2003-03-23)
  • Prior to the series being made, the pilot episode aired as a yearly Halloween special from 1996 to 1999.

Home Media Releases

Several episodes of the series have been released on VHS and DVD with each containing two episodes each.

  • Disc one: "Monster on Purpose," and "The Jewel of Fenrath"
  • Disc two: "Badgering Billy," and "Haunted House"
  • Disc three: "Sasquashed," and "Campsite Creeper"

Several VHS tapes of the series were released in 1999 & 2000

  • Monster By Mistake and Entertaining Orivilie
  • Home Alone and Monster a Go-Go
  • Fossil Remains and Kidnapped
  • Gorgool's Pet and Jungleland

As of 2020, 29 out of the 52 episodes have been uploaded to the official Monster By Mistake youtube channel, with prior to January 2019, a new episode being uploaded every Thursday. Currently, the channel has stopped on episode 29 (Watch the Birdie). It is unknown if the channel will continue to upload episodes.

All 52 episodes were previously available on Amazon Prime in America only.

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