William Theodore Katt (born February 16, 1950) is an American film and television actor, best known as the star of The Greatest American Hero. He first became known for playing Tommy Ross, the ill-fated prom date of Carrie White in the film version of Carrie (1976) and subsequently starred in films such as First Love (1977), Big Wednesday (1978) and Butch and Sundance: The Early Days (1979). His mother is Barbara Hale, who played Della Street in the television series Perry Mason. Katt later played Paul Drake Jr. in the Perry Mason TV movies. His father was actor Bill Williams, who was best remembered for starring in the classic series The Adventures of Kit Carson.