Alfred "Al" Delvecchio is a character on the U.S. sitcom Happy Days. He was played by Al Molinaro. Molinaro joined the cast in Season 4 after Pat Morita, who played Arnold, left after the end of the third season (in the last episode "Arnold Gets Married"). Subsequently Molinaro also played Al's twin brother priest Father Anthony Delvecchio. Al said that he also had a brother who worked at the sanitation department.