Bob is a guest character in Pet Alien. He appeared in the episode, "The Guest That Wouldn't Leave".
Bob was brought to earth by Dinko and Gumpers to help Tommy beat Granville in a battle card duel. Bob was the aliens old neighbor from Conforma and he picked on Gumpers and stole all his candy. After he beat Granville, Bob decided to take over the planet and kick Tommy and his pets out of the lighthouse. However, just as Bob was about to suck the aliens into a black hole, Gumpers stood up to Bob and his black hole was clogged up by one of Swanky's feathers and Bob was defeated once and for all.