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In the second part of the season finale, Li'l Gideon has managed to take possession of the Mystery Shack and unless the Pines family can somehow reacquire it, the fate of their beloved tourist trap is doomed.
To get his hands on the deed to the Mystery Shack, Li'l Gideon summons Bill Cipher, a supernatural entity with the ability to steal a memory from a person's mind. This is part one of the two-part season finale.
When a prehistoric beast snatches Waddles, the Pines family must journey to a land trapped in time to rescue him.
Mabel finds out her favorite boy band is a bunch of trapped clones and tries to free them. Meanwhile Dipper is convinced that Robbie is trying to brainwash Wendy with a secret message hidden in one of his songs.
After discovering a hidden room inside the Mystery Shack, Dipper and Mabel compete over who should have it because they want their own space. When competing the two figure out that the carpet in the room has electric body swapping properties.
When Mabel befriends a cute merman trapped in the public pool, she's determined to help him out.
Dipper, Mabel, Soos, and Stan fall into a bottomless hole. As they fall, they pass the time by telling stories to each other.
Grunkle Stan bets Mabel that for the next 72 hours, he can make more money on vacation than she can running the Mystery Shack. The winner gets to be the boss for the rest of the summer.
Dipper and Wendy are excited to take part in Gravity Fall's annual event, Summerween. But when Dipper hears Wendy say that trick-or-treating is for kids, he reconsiders.
Dipper gets unconformable with the fact that he is shorter than Mabel. So he searches for some magic that can make him grow. Then Gideon finds out about the magic and tries to tamper with their heights.
Challenged to a fight by Wendy's boyfriend, Robbie, Dipper is left feeling helpless and hopeless. His apprehension turns to excitement, however, when he finds out that he can turn characters from his favorite arcade game, Fight Fighters to life, he chooses Rumble McSchermish so he doesn't have to fight Robbie. It looks like Dipper has the upper hand but then things take a turn for the worse.moreless
Dipper wishes he could travel back in time and fix his mistake he made in the past. He then discovers a time machine that can help him. Meanwhile, Mabel finds her first love when she wins a pet pig at the fair.
Dipper discovers a secret about the town and sets out to uncover it. Mabel tags along to prove she isn't silly.
When Grunkle Stan throws a big party to advertise the Mystery Shack, Dipper uses an off-kilter copy machine to make a clone of himself to be at two places at once. Meanwhile, Mabel stands up for her friends and tries to gain the "Party Queen" title in their honor, instead of having a popular girl and her group win.moreless
Tired of being a wimp, Dipper wants to be a real man and meets a manotaur who can help. Dipper does the manotaurs' challenges to prove what he's got to be a real man. Meanwhile, Mabel teaches Grunkle Stan how to become more a gentleman for his love interest, Lazy Susan, the waitress at their local diner.moreless
Dipper and Mabel tag along with Wendy and her friends to this condemned convenience store. Dipper tries to impress Wendy along the way, but haunted things get in the way.
The gang decide to visit a show starring Lil' Gideon, a psychic kid and Grunkle Stan's competitor, where he demonstrates his psychic powers. He falls in love with Mabel and invites her to meet him. She refuses to go, but also doesn't want to break his heart. But when Dipper persuades Mabel to go on a date with Gideon to question his genuineness, she soon learns he will lose his cuteness too quickly.moreless
Dipper and Mabel must use their best sleuthing skills to uncover who is behind the sinister events after the discovery of a hidden room reunites the Mystery Shack with its long forgotten collection of wax figures.
Dipper and Mabel enlist Soos to help them prove a lake monster is real.
When Dipper and Mabel go to spend their summer with their Great Uncle Stan, Dipper comes across a journal telling about the mysteries of Gravity Falls and suspects that Mabel's new boyfriend is a zombie.