What was Richard Dean Anderson famous from before Stargate?
Stargate SG-1 (season 7):  Season seven regular cast members include Richard Dean Anderson, Amanda Tapping, Christopher Judge, Michael Shanks, and Don S. Davis. Richard Dean Anderson:  He began his television career in 1976, playing Dr. Jeff Webber in the American soap-opera series "General Hospital", then rose to prominence as the lead actor in the television series "MacGyver" (1985–1992).
the television series "MacGyver" (1985–1992)