During the fall of 1977, Saturday morning tv featured several live-action programs, including Skatebirds, an anthology series that ripped off The Banana Splits from a decade before. It didn't last long, but one of its live-action segments, Mystery Island (note: not Mysterious Island) was noteworthy for two reasons.
1. It recycled the famous Lost in Space robot.
2. The mega-muscular Stephen Parr spent most episodes with his shirt off.
There's not much else to find out about Stephen Parr. He worked as a model (naturally). Beginning in 1975, he had guest shots on lots of tv series, from Barnaby Jones to Cheers, and had a brief starring role on All My Children. According to the Internet Movie Database, he last worked in television in 1993. I don't know what he's doing now. But he certainly brightened a lot of Saturday mornings in 1977.