“Streets of San Francisco” (1977), a crime drama series that in its last season, had an episode with both Richard Hatch and Mark Hamill.
Scifi and Sword and Sorcery actor Richard Lynch.
Battlestar Galactica Cosplayer at L.A. Con II, 1984 (aka the 42nd Worldcon).
Between 1980 and 1992 (!), there was an attraction at Universal Studios called “Battle of Galactica,” which included a meet and greet with a Cylon.
Here’s a video of a visit: