Dr. Marmalade

Dr. Marmalade is the main antagonist of Aaron Blabey's Bad Guys franchise. He is an evil guinea pig who wants to take over the world or destroy the world. His real name is Rupert.

He appears in every episode except the first episode. He was first seen in episode 2 and was thought to be a harmless and innocent guinea pig. But, he was later revealed to be evil in episode 3.

He was a guinea Pig in the first five books. In episode 6, however, he was revealed to be an alien.