Agent Rat, or "Ratborg", is one of the Animal Borgs seen in the episode "Tales from the Resistance: Back to the 2nd Dimension." It is first seen filing Charlene Doofenshmirtz's fingernails. It later cuts one of them when it has its evil programming rewritten.
Before the hat, Possumborg's body is metallic minus its face, left leg and one of its ears. Somehow, it becomes organic again when it has its hat on.
- "Tales from the Resistance: Back to the 2nd Dimension" (First appearance)