|Snake Armed Ruby Brain Beast|
|Name||Snake Armed Ruby Brain Beast|
|Introduced in||"Tree Trunks"|
The Brain Beast or Snaked Armed Ruby Brain Beast makes its first appearance in "Tree Trunks." During the episode, the beast attacks Finn, Jake, and Tree Trunks in the Evil Forest. Tree Trunks tries to seduce it with her "charm" and "elephant prowess." Finn saves Tree Trunks by hitting the magic gem weak spot on it's back and killing it. When the creature dies, it slowly dissolves into thin air.
The Brain Beast later makes a cameo appearance in "Henchman."
It looks like a pink brain, with long snakes coming out of it for arms. There is a large ruby gem on its back and breaking this gem will instantly kill the creature.