Octocat is a mutant who worked as the minion of Mister Smarty Smarts, but was also his closest confidente and friend. She is one of the only mutants to not speak, instead conversing in meows. Despite this, the other mutants still understand what she is saying. Before the Doctor got arrested, she was blasted with a ray to become a super-soldier with Fuzzy.
Although she helps Mister Smarty Smarts with his evil schemes, she does seem to have some what of a conscience, as displayed when she persueded Smarts to confess that he was unable to read a book containing Peri's purpose, and he learns to read with the help of Octocat and his robotic minion. (Stuck Together)