Weirdmageddon Part 1

"" (promoted as Xpcveaoqfoxso) is the 18th episode of the second season of Gravity Falls and the thirty-eighth episode overall. It premiered on October 26, 2015.

Official overview
TBA.

Synopsis
The episode opens right where "Dipper and Mabel vs. the Future" left off, with Bill Cipher laughing at the gateway between the Nightmare Realm and Gravity Falls. His body gains flesh, metal, and pure energy as Bill finally obtains a physical form, becoming a triangle of light.

Blendin Blandin sees the carnage above, and is helpless to watch as Mabel's unconscious body is lifted up and sealed in a pink bubble emblazoned with a shooting star. Chains wrap around the bubble, sealing Mabel inside. Blendin taps his wristwatch, saying that he has a situation before teleporting away.

The townspeople of Gravity Falls all look up in the sky in fear as Bill grows in size, becoming a rotating pyramid-like abomination with six arms and a pure black form with multicolored energy. Bill returns to his normal form and floats down to the town, announcing that he will be the lord and master of Gravity Falls for eternity. He then melts a statue of Nathaniel Northwest as the townspeople watch in despair.

Bill then introduces the town to the other residents of the Nightmare Realm that Bill calls his friends, each more grotesque and anomalous than the last: 8-Ball, Kryptos, Xanthar, Teeth, Keyhole, Hectorgon, Amorphous Shape, Piranicha, Pacifier, and a bunch of floating eyeballs. The townspeople don't react kindly to the display, urging Bill and his friends to get out of town. Preston Northwest offers to join Bill and become one of his "horsemen of the apocalypse", but Bill switches all the body parts on Preston's face instead, making him have no mouth yet he must scream. Bill promptly unleashes flying eyeballs and madness bubbles all over town that petrify, abduct, and instill insanity in the people of Gravity Falls. He also summons a gargantuan black pyramid from the ground to serve as his castle, and animates the Gravity Falls water tower. After proclaiming that time is dead and meaning has no meaning, Bill welcomes one and all to Weirdmageddon.

Credits

 * Written by:
 * Josh Weinstein
 * Alex Hirsch


 * Directed by:
 * Sunil Hall


 * Storyboarded by:
 * Ben Holm
 * Dana Terrace
 * Stephen Sandoval
 * Luke Weber


 * Additional Written Material by:
 * Jeff Rowe


 * With the Voice Talents of:
 * Jason Ritter as Dipper
 * Alex Hirsch as Grunkle Stan and Soos
 * Louis C.K. as The Horrifyingly Sweaty One-Armed Monstrosity
 * J.K. Simmons as Ford
 * Will Forte as Tyler Cutebiker
 * Danielle Fishel as Pyronica
 * Patrick McHale as Hectorgon
 * Andy Merrill as Teeth
 * Brian Bloom as Rumble McSkirmish
 * Jennifer Coolidge as Lazy Susan
 * Carl Faruolo as Grenda
 * Jackie Buscarino as Pacifica Northwest
 * John DiMaggio as Manly Dan
 * Nathan Fillion as Preston Northwest
 * Linda Cardellini as Wendy
 * Kevin Michael Richardson as Sheriff Blubs
 * Justin Roiland as Blendin Blandin
 * Thurop Van Orman as Li'l Gideon
 * Dave Wittenberg as Time Baby
 * Gregg Turkington as Toby Determined
 * Niki Yang as Candy
 * Matt Chapman as Abuelita
 * Dee Bradley Baker as Sprott
 * Kari Wahlgren as Shandra Jimenez
 * Additional voices:
 * Alex Hirsch as Bill Cipher and Gnomes
 * Kevin Michael Richardson as Ghost-Eyes
 * Dave Wittenberg as Lolph

Character revelations

 * Dipper and Mabel's allergies go off at the same time.
 * Ghost-Eyes majored in philosophy.
 * The Corduroys train for the end times instead of celebrating Christmas.

Series continuity

 * The episode continues immediately after "Dipper and Mabel vs. the Future," following Bill's success in opening a gateway to the Nightmare Realm.
 * In "The Last Mabelcorn" Bill says, "I've been making deals, chatting with old friends, preparing for the big day." In this sentence he foreshadows his entrance with other demons into Gravity Falls' world.
 * The snake and the badger from "The Love God" make an appearance running out of the forest.
 * Chutzpar, the Manotaur from "Dipper vs. Manliness," is seen fleeing the forest with other animals.
 * Tyler Cutebiker is shown as Gravity Falls' mayor after winning the election in "The Stanchurian Candidate."
 * Rumble McSkirmish reappears when the Arcade is flooded with a weirdness wave.

Trivia

 * Bill Cipher's page from the opening theme is seen with a hole where Bill's picture should be, nodding to the fact that he has finally entered Gravity Falls' dimension.
 * At the end of the opening theme, a faint whisper can be heard that is different from the ones heard throughout the show. When the theme is reversed, Bill can be heard saying "I'M WATCHING YOU."
 * An apocalypse version of the theme song is used for this episode where Bill and his minions replace the main characters in every shot.
 * 618 appears on a tank.

Cryptograms

 * The cryptogram in the episode's credits reads, "KB HTMT IHOV 1,000 AMLCT WDY TZOM MLCG'H TSCGKFWFA IV VVEWYDUQIBXV CVO HIMC OI'J DINV, IM'H NSZPO EZ CM KLVP EZLYLG." Once decoded using the Vignère key CILLBIPHER, it reads "IT WILL TAKE 1,000 YEARS FOR TIME BABY'S MOLECULES TO RECONSTITUTE. AND WHEN HE'S BACK, HES GOING TO BE VERY CRANKY."
 * The cryptogram in the episode's end page reads, "17-23-11-19 15-5 9-2-19-6, 23-10-20 15 1-9-10. 10-9-1 15-4'5 4-15-11-19 4-9 5-4-23-6-4 4-16-19 18-3-10. 15 23-12-1-23-25-5 12-9-2-19 21-9-6-6-3-8-4-15-10-17 12-15-2-19-5. 10-9-1 12-19-4'5 5-19-19 1-16-15-21-16 8-15-10-19-5 5-3-6-2-15-2-19-5." Once decoded using the combined cipher it reads, "GAME IS OVER, AND I WON. NOW IT'S TIME TO START THE FUN. I ALWAYS LOVE CORRUPTING LIVES. NOW LET'S SEE WHICH PINES SURVIVES."
 * The title card flickers from "Gravity Falls" to "JUDYLWB IDOOV," which, when translated with the three letters back Caesar cipher, says, "GRAVITY FALLS."