Eons before the events of the series 8 Ball indulged in criminal activities before being called together by Bill Cipher, along with Amorphous Shape, Hectorgon, Keyhole, Kryptos, Paci-Fire, Teeth, Pyronica, and Zanthar.
In "The Last Mabelcorn," after Ford receives Bill's warning that Weirdmageddon is coming, 8 Ball's arms are briefly seen on an image of a wheel with symbols. Near the end of the episode, in a flashback, when Ford confronts Bill for lying to him, 8 Ball's laughing silhouette is seen in the representation of another dimension projected in the Mindscape.
In "Weirdmageddon Part 1," during the cold open, Bill introduces 8 Ball along with the rest of his friends to the residents of Gravity Falls. Afterwards, on Main Street, 8 Ball and the others watch Bill turn Ford into a golden statue, taunt Dipper and burn the journals. Bill then tells 8 Ball and Teeth to eat Dipper as a reward. However, Dipper manages to get away from them. Later in the episode, after Time Baby and the Time Police are vaporized, 8 Ball and Teeth approach Bill to warn him that Dipper is still roaming free, and might try to free Mabel from her bubble. However, Bill isn't worried, as he has Gideon on the case, so the party carries on.
In "Weirdmageddon 2: Escape From Reality," 8 Ball and the rest of Bill's friends attempt to leave Gravity Falls to spread their chaos across the world, only to collide with an invisible barrier. They are later subjected to Bill's rage over their inability to leave.
In "Weirdmageddon 3: Take Back The Falls," 8 Ball participates in the battle against the Shacktron, during which the being is hit by one of the Eye Bats' beams when Wendy hijacks it, turning most of 8 Ball's head into stone. Following Bill's defeat, 8 Ball is sucked back into the Nightmare Realm along with its comrades.
8 Ball and Keyhole make a brief cameo during the tale "Don't Dimention It!", when Mabel falls through dimentions, among them the Nightmare Realm. He and Keyhole are standing next to a statue of Bill that reads "HE WAS THE WORST" in it's base, he and Keyhole are staring at it with an angry face. This implies that maybe he and Keyhole hated Bill or maybe is a common feeling for all the Henchmaniacs. Also, his head has been healed since his incident with Wendy in the finale.
8 Ball is olive green, with a lighter chest and stomach, and has a muscular upper body. It has large ears with a what apears to be a bite in one of them, a prominent underbite and large teeth and fangs. 8 Ball's eyes are magic 8-balls that glow yellow at the pupils which usually are pointed in different directions. The being has cuffs around its right wrist and ankle, with a small segment of broken chain dangling from both of them.
- Intro: "Gravity Falls Main Title Theme"
- 215. "The Last Mabelcorn" (flashback, no lines)
- 218. "Weirdmageddon Part 1"
- 219. "Weirdmageddon 2: Escape From Reality" (no lines)
- 220. "Weirdmageddon 3: Take Back The Falls" (no lines)
- Robertryan Cory, who designed the Henchmaniacs, had the most trouble coming up with 8 Ball's appearance., as evidenced by his multiple character designs of the being.
- 8 Ball appears as an easter egg in Rick and Morty's episode "Rest and Ricklaxation". He may be seen lying between all the snot in the toxic world.
- 8 Ball replaces Dipper in the Weirdmageddon intro, with him being scared and dropping the candle at the sight of Dipper's body, rather than vice versa.
- 8 Ball and Zanthar are the only Henchmaniacs that aren't seen after the fight with the Shacktron.
- 8 Ball and Keyhole make a cameo in Gravity Falls: Lost Legends, during the tale "Don't Dimention It!" when Mabel falls through dimentions. He and Keyhole are standing next to a statue of Bill that reads "He was the Worst", implying he and the rest of the Henchmaniacs probably loathed him.
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