Gravity Falls (season 2)

Stan continues to work on the portal and 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. However, 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.

Dipper's journal's 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.

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

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.

After Soos promises his grandmother to find a date for his cousin Reggie's engagement party, Dipper and Mabel offer to help him find one. Eventually, he looks to 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 malicious and extremely jealous AI when Soos meets Melody, a girl who works at a meat stand, and asks her for a date. Meanwhile, Stan plans to steal a kiddie robot for the Mystery Shack.

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

• "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 claymation 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.

Blendin Blandin returns to face off with 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.

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.

The Northwests hire Dipper to deal with a ghost that threatens to disrupt their party. During the party, Candy, Grenda and Mabel fight over a boy they all want to date.

After government agents take Stan into custody, Dipper and Mabel begin to question how much they really know about their Grunkle Stan 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.

Trapped under the Mystery Shack, Stan has to reveal his portal and 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 got sucked inside it due to a mishap with Stanley, his estranged con-artist brother. To survive, Stanley then assumed his brother's identify as "Stanford Pines", and spent the next thirty years trying to fix the portal to get Ford back – but he wasn't able to reactivate it without the information from Ford's other two journals, until the kids recently recovered them. In the end, the agents leave after having their memory erased, and Stanford decides to live in the underground lab under the Mystery Shack. However, 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.

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Dipper finds his favorite board game called "Dungeons, Dungeons, and More Dungeons", and Great Uncle Ford joins him. However, when Grunkle Stan accidentally rolls Ford's Infinity-Sided Dice he found in a different dimension, 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.

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

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, but Bill was waiting for the reactivation ever since, and once he gets his hands on the interdimensional rift created by the portal it would mean the end of the world.

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.

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 it's buried under the town. It was using parts of this alien technology that Ford constructed the dimensional portal under the Mystery Shack. 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.

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.

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

Dipper, Soos and Wendy go inside 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.

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