Gravity Falls (season 2) facts for kids

Stan continues to work on the portal while the Mystery Shack throws a grand re-opening party after the Li'l Gideon incident. Meanwhile, when Dipper meets two government agents, he tries to tell them about the mysteries of Gravity Falls by showing them his journal. When the agents don't believe anything written in the journal, Dipper ends up conjuring up zombies to prove to them he's not crazy.

Guest stars: Nick Offerman as Agent Powers, Brad Abrell as Agent Trigger

Dipper's journal pages lead the gang to the author's hidden bunker where they find themselves face-to-face with an evil shapeshifter whom the author raised from a mysterious egg. Meanwhile, Dipper finally builds up the courage to tell Wendy how he feels about her.

Guest star: Mark Hamill as The Shape Shifter

After being belittled by Pacifica one too many times, Mabel challenges her to a miniature golf-off which gets out of control when she and Dipper discover that living golf balls control the courses.

Guest stars: Patton Oswalt as Franz, Frank Caliendo as Sergei, Nathan Fillion as Preston Northwest, John O'Hurley as Knight Lilliputtian, Jim Cummings as Pirate Lilliputtian, John Roberts as Xyler, Greg Cipes as Craz

Mabel attempts to make the perfect sock puppet show to impress her new crush. Meanwhile, Dipper tries to figure out the password to the laptop found in the bunker, while Bill Cipher wants to make a "deal" with him.

Guest star: Jorma Taccone as Gabe Bensen

After Soos promises his grandmother to find a date for his cousin Reggie's engagement party, Dipper and Mabel offer to help him. Eventually, he uses a dating simulator to help him talk to girls. However, Giffany, the girl in the game, becomes obsessed with Soos and reveals herself as a sentient, malicious and extremely jealous AI after Soos asks Melody, a girl who works at a meat stand, for a date. Meanwhile, Stan plans to steal a kiddie robot for the Mystery Shack.

Guest stars: Jillian Bell as Melody, Jessica DiCicco as Giffany, Paul Scheer as Gary, Brian Bloom as Rumble McSkirmish

Stan tries to sell Mystery Shack merchandise to an unknown buyer by telling stories about each item he sells. Stories include:

• "Hands Off": After stealing her gold watch, Stan is cursed by a witch and loses his hands.
• "Abaconings": Waddles becomes smart because of a mysterious mushroom and soon becomes so smart he forgets about Mabel.
• "Clay Day": Mabel confronts her fear of stop motion animation by fighting clay monsters.

Guest star: Neil deGrasse Tyson as "smart" Waddles

Dipper, Mabel, Soos, Wendy and Old Man McGucket discover a secret society in Gravity Falls that erases people's memories of the supernatural.

Guest star: Peter Serafinowicz as Blind Ivan

Blendin Blandin returns to face off against Dipper and Mabel in a futuristic, potentially deadly battle. Meanwhile, Soos is upset about his birthday, and Dipper and Mabel try to figure out why.

Guest stars: Justin Roiland as Blendin Blandin, Dave Wittenberg as Time Baby and Lolph, Diedrich Bader as Dundgren

Mabel takes matchmaking too far when she steals a love potion from a real Love God to use on Robbie and Tambry. Meanwhile, Stan decides to create a hot air balloon for the Woodstick music festival.

Guest star: John DiMaggio as Love God, Jillian Bell as Melody

The Northwests hire Dipper to deal with a ghost that threatens to disrupt their party but Dipper soon find out the Northwests's secret from that ghost. During the party, Candy, Grenda and Mabel fight over a boy they all want to date.

Guest stars: Nick Offerman as Agent Powers, Brad Abrell as Agent Trigger, Nathan Fillion as Preston Northwest

After government agents take Stan into custody, Dipper and Mabel begin to question how much they really know about their Grunkle and must work out whether or not they truly trust him anymore. Finally, the portal is activated and the author of the journals is revealed to be Stan's long-lost brother, who emerges from the portal as Dipper, Mabel, Soos and Grunkle Stan look on.

Guest stars: Nick Offerman as Agent Powers, Brad Abrell as Agent Trigger

Stan has to reveal his past to Dipper and Mabel, along with the secrets of his twin brother, Stanford "Ford" Pines. Stan's real name is actually Stanley Pines: thirty years ago Ford constructed the portal but was trapped inside it due to a mishap with Stanley, his estranged con-artist brother. Stanley assumed his brother's identify as "Stanford Pines", and spent the next thirty years trying to fix the portal to get Ford back. He was finally able to reactivate the portal after the kids discovered Ford's missing journals. In the end, the agents leave after having their memories erased, and Stanford decides to live in the underground lab under the Mystery Shack. Grunkle Stan makes him promise he will leave the kids alone after being told that he would have to leave the Mystery Shack at the end of the summer.

Guest stars: Nick Offerman as Agent Powers, Brad Abrell as Agent Trigger, Jonathan Banks as Filbrick Pines, J. K. Simmons as Stanford Pines

Dipper finds his favorite board game called "Dungeons, Dungeons, and More Dungeons", and Great Uncle Ford joins him. When Grunkle Stan accidentally rolls Ford's Infinity-Sided Dice, the characters from the game come to life and capture Dipper and Ford. Meanwhile, Mabel, Grunkle Stan and Grenda try to watch the Ducktective season finale.

Guest stars: "Weird Al" Yankovic as Probabilitor, J. K. Simmons as Stanford Pines

When Stan decides to run for mayor, Dipper and Mabel must make him a better candidate to increase his chances.

Guest stars: Cecil Baldwin as Tad Strange, J. K. Simmons as Stanford Pines

Mabel and her friends go on a magical quest to get unicorn hair in order to protect the Mystery Shack from Bill Cipher. Meanwhile, Dipper finds out that Bill and Ford used to be partners and designed the portal together. However, Bill tricked him the whole time, so Ford had to shut down the portal. Bill has been waiting for the reactivation ever since, and once he gets his hands on the interdimensional rift created by the portal it will mean the end of the world.

Guest stars: Sam Marin as Celestabellebethabelle, J. K. Simmons as Stanford Pines

Stan brings the kids on a road trip to ruin every other tourist trap in Oregon. Meanwhile, Stan tries to help Dipper get over Wendy.

Guest star: Chelsea Peretti as Darlene

Mabel decides to plan her and Dipper's 13th birthday party. Meanwhile, Ford reveals to Dipper the most surprising secret yet – a giant UFO which, according to Ford, crashed millions of years ago and is buried under the town. It was by using parts of this alien technology that Ford was able to construct the dimensional portal. Bill Cipher tricks Mabel into handing him the interdimensional rift, which Bill then uses to enter the physical world and open a portal from his own dimension. The end of the world begins.

Guest stars: Justin Roiland as Blendin Blandin, J. K. Simmons as Stanford Pines

The ultimate battle for the fate of the world begins as Bill Cipher and his "friends" are released from their dimension. Meanwhile, Dipper and Wendy try to save Mabel from a prison bubble designed by Bill and guarded by Gideon.

Named “Xpcveaoqfoxso” in subsequent airings.

Guest stars: Louis C.K. as The Horrifyingly Sweaty One-Armed Monstrosity, Danielle Fishel as Pyronica, Patrick McHale as Hectorgon, Andy Merrill as Teeth, Brian Bloom as Rumble McSkirmish, Nathan Fillion as Preston Northwest, Justin Roiland as Blendin Blandin, Dave Wittenberg as Time Baby and Lolph, J. K. Simmons as Stanford Pines

Note: Jason Ritter and Linda Cardellini also appear briefly as Dipper and Wendy (respectively) in a live-action shot.

Dipper, Soos and Wendy enter Mabel's bubble to save her and discover an odd world inside of it. Meanwhile, Bill and his friends try to initiate the second phase of their master plan.

Guest stars: Jon Stewart as Judge Kitty Kitty Meow Meow Face-Schwartstein, John Roberts as Xyler, Greg Cipes as Craz, Danielle Fishel as Pyronica, Patrick McHale as Hectorgon, Eric Bauza as Ernesto, Alfred Molina as the Multi-Bear

Dipper and Mabel rally the town to fight against Bill Cipher and his minions in one final stand to save the world from destruction.

Guest stars: Nathan Fillion as Preston Northwest, Larry King as Wax Larry King, Alfred Molina as Multi-Bear, Cecil Baldwin as Tad Strange, Danielle Fishel as Pyronica, Andy Merrill as Teeth, Louis C.K. as The Horrifying Sweaty One-Armed Monstrosity, Kyle MacLachlan as Bus Driver, J. K. Simmons as Stanford Pines