Stacks

Stacks is Galileo's robot that Galileo built out of junk and is one of the first five characters in Groundling Marsh who makes his debut in Fungus Amongus. He is performed by James Rankin.

Personality
Stacks eventually becomes a mobile unit when his essential components are placed in a special motorized vehicle (which Mud/Slinger created for him using an old shopping cart) and for which he is very grateful (though he gets carried away at first). Mostly, he is humble and kind, and tries to answer the Groundling's questions with information from his data base. He sometimes feels insignificant being "just a machine" (as in the Season 1 episode, Life Before Stacks which also shows his origins).