User:ThePokémonGamer/sandbox

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, informing the Time Paradox Avoidance Enforcement Squad of the 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, Pyronica, 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. Bill then 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.

Meanwhile, Dipper and Ford watch the carnage from the Mystery Shack, their solitude interrupted by a flock of birds passing overhead. Many more animals, including the gnomes and a Manotaur, follow suit, knocking Dipper over. Ford picks him back up and telling him that with every passing minute, Bill's dimension leaks into theirs and his power grows. Dipper realizes that the interdimensional rift must have opened in Mabel's hands, and he runs off to go find her, trying to contact her through walkie-talkie.

Ford stops Dipper, telling him that before they can find Mabel, Bill must be stopped. Their best shot is to knock him back into the rift from where he came before Weirdmageddon spreads across the entire world. Ford isn't sure if it's even possible, but they have to try. The two abruptly stop when a gnome announces that a "weirdness wave" is headed their way. Dipper and Ford rush inside as a giant pink tsunami rushes over the entire town.

The weirdness wave spawns a tentacle in Soos' backyard, and it turns Abuelita into a chair. Soos is shocked by the tidal wave of madness, but Abuelita urges Soos to go help the others around town. Soos follows her order and heads off. Meanwhile, Stan is telling off Gompers for chewing on his fez's tassel. The weirdness wave causes Gompers to grow past the treetops of the forest, and Stan runs away with Gompers in pursuit. Next, it washes over the arcade, resummoning Rumble McSkirmish and also bringing other arcade characters to life.