John Colicos is famous for three things inperticular.
1. Playing the first ever klingon seen in star trek.
2. Playing the villian in numerous TV shows.
3.Playing the original Baltar in Battlestar Galactica.
His acting abilities amazed me even further when i found out he plays Apocolypse in the X-men animated series. a show i have loved since childhood. With his career being cemented in science fiction and fantasy, John believed that program's such as star trek and BSG were to represent how the future could turn out, and had great belief in the sci-fi. Although no longer with us his work will live on in history and fans will always know the name John Colicos.
If you see any interviews with John you'll see how excentric (in a good way) he actually is.