Gremlin Gus is the leader of the Gremlins and serves as a guide for Mickey. Almost like Jiminy Cricket from Pinocchio, he is the one that tells the player all the basic controls and how to execute actions.
In the beginning of the game, Gus rescues Mickey from the maniacal Mechanical Arm in the Mad Doctor's Lab in Dark Beauty Castle. The Gremlins reside in Gremlin Village, which resembles the It's a Small World attraction.
Throughout the game, 30 caged Gremlins can be spotted. Mickey can either help or abandon them.
The Gremlins, including Gremlin Gus, return in Epic Mickey 2: The Power of Two. They play larger roles than in the first game. Caged Gremlins also reappear some with electricity blots around them that Oswald needs to turn off before Mickey can spin attack to break them open and free them.