Molloy is a cat burglar who lived at Springfield Retirement Castle. He started a crime wave in Springfield, that ended with the world's largest zirconia being stolen, which led to his arrest. He mentioned having been a cat burglar for years. He tricked the entire town into going on a phony treasure hunt, and he escaped from prison when they were all gone.
- Bart's portable TV and stamp collection
- Lisa's saxophone
- Marge's necklace
- Flanders's Shroud of Turin beach towels
- Skinner's Stormin' Norman commemorative plates (which had been previously stolen)
- Barney's clothes and furniture
- Selma's lock of MacGyver's hair
- The world's largest cubic zirconia
He appeared again as one of the suspects when the zirconia was stolen again.
- Episode – "Homer the Vigilante"
- Comic book – Simpsons Comics 114
- Video game – The Simpsons: Tapped Out