Synopsis by Mark Deming
One morning, the Simpsons wake up to discover that they have become the latest victims of the Springfield Cat Burglar, a thief who has been breaking into peoples homes and robbing them under the cover of night. (Of course, it was a rather simple matter at the Simpson household, since Homer [voiced by Dan Castellaneta] left his keys in the front door.) Upset over the recent crime wave, Homer starts a Neighborhood Watch group to catch the burglar, but for some reason Homer and his friends seem attract the wrong element, and they end up creating more crime than they prevent. When the Springfield Museum gets word that they're to be the burglar's next target, Homer and his watchdogs stake out the museum, but Homer ends up getting drunk with a group of juvenile delinquents, and the cat burglar makes off with the world's largest cubic zirconia. Grampa Simpson (voice of Dan Castellaneta), however, has uncovered the identity of the cat burglar -- he's an elderly gentleman named Molloy (voice of Sam Neill) who lives at the same retirement home. "Homer the Vigilante" was first broadcast on January 6, 1994.