Mr. Hal Gibson

Mr. Hal Gibson, or just Gibson (played by Tom Kenny), is the scientist of the group. He works with Otto.

Appearance
Gibson is a blue monkey with black eyes. During fights, his hands become in drills.

In the episode "Thingy", his appearance changed temporarily when he was infected by a virus from the Skeleton King. Gibson acquired more stature, his hair changed to a shade of blue more opaque, his eyes became red with purple circles, like all the part of the face. The antennae of his ears have a distorted appearance without the spheres at the end of each one. The regular appearance in his hands changed to claws, his tail and feet turned dark.