Molloy

Molloy, aka The Springfield Cat Burglar, is a villain who appeared in The Simpsons episode Homer the Vigilante.

Main
One night, as the Simpson family sleeps, they are robbed by a mysterious cat burglar, who leaves a visiting card. Ned Flanders comments that he was robbed too, and they realize it's a crime wave.

As the police department is unable to do anything about these crimes, the citizens organize a vigilante group led by Homer, intended to capture the burglar. One day, while Homer is being interviewed by Kent Brockman, they receive a call by Molloy himself, telling that he plans on stealing the world's largest zirconia from the Springfield museum. Homer and his group arrange a 24-hour guard at the museum, but the cat successfully steals the precious gem while Homer is sleeping it off at his shift.

Finally, Molloy is captured with Grampa Simpson's help, and he returns the stolen goods before being taken to jail, where he tricks the citizens into searching for a nonexistent treasure, which was supposedly buried under a giant T. He uses this time to escape, leaving behind a farewell letter.