Eons before the events of the series, Lava Lamp Guy indulged in criminal activities before being called together by Bill Cipher, along with 8 Ball, Amorphous Shape, Hectorgon, Keyhole, Kryptos, Paci-Fire, Pyronica, Teeth, and Zanthar.
Lava Lamp Guy is first seen in "Weirdmageddon Part 1." The being is among Bill's friends the former takes them to the Fearamid. It is partying and playing "spin the person" when Time Baby and the Time Paradox Avoidance Enforcement Squadron interrupt their party.
In "Weirdmageddon 2: Escape From Reality," it is seen again dancing in the Fearamid, before Bill announces that they are taking "chaos worldwide."
It resembles a cylindrical lava lamp full of yellow liquid and orange bubbles. It has two dark orange and red lava blobs shaped like eyes and a large jagged opening under them that looks like a mouth. The top looks like a black bowler hat with a red band around it.
- 218. "Weirdmageddon Part 1"
- 219. "Weirdmageddon 2: Escape From Reality" (no lines)
- 220. "Weirdmageddon 3: Take Back The Falls" (no lines)
- It is the only minion of Bill Cipher that isn't introduced. This is likely because it did not appear until later on, after the other minions had long been present.
- Unlike the majority of the Henchmaniacs, Lava Lamp Guy was not involved in the fight against the Shacktron.
- His name (Lava Lamp Guy) is revelated in a deleted scene from Weirdmageddon 2: Escape From Reality, that appears in the Gravity Falls: The Complete Series blu-ray set.
- In the same scenes, he went through 2 different designs: In Weirdmageddon Part 1 he was suppoused to be a large monster about Zanthar's size, and in Weirdmageddon 2: Escape From Reality his design is closer to the final one. Note how in both cases he was planned to wear a fez.
- For some reason during Weirdmageddon 2: Escape From Reality, he lacks his orange aura, and also he's opaque, when he's suppoused to be transparent.
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