Snake-Armed Ruby Brain Beast
The Snake-Armed Ruby Brain Beast (or Brain Beast for short) makes its first appearance in “Tree Trunks”. It looks like some kind of a brain, with long snakes coming out of it for arms, and on its back it holds a ruby, which if hit will kill the Brain Beast immediately. In the episode, the Brain Beast hunts down Finn and Jake in the Evil Dark Forest. Tree Trunks tries to win over the brain beast with her charm, and elephant prowess. Finn and Jake then have to hit the beast’s weak spot to kill it.