Richard (1 episode, 1988)
Boris Steloff / ... (2 episodes, 1992-1994)
King Galen of Moldavia (15 episodes, 1985-1986)
Dr. Quentin King (2 episodes, 1989)
Alex Ward (8 episodes, 1980-1981)
Nightingale (1 episode, 1978)
Alexander Drew (1 episode, 1976)
Dr. David Bellman / ... (2 episodes, 1974)
Eli Mason / ... (2 episodes, 1973-1975)
Carl Blessing / ... (2 episodes, 1973-1975)
Dr. Charles Hunter (1 episode, 1978)
Barry Shire (28 episodes, 1999-2010)
Mr. Smith (7 episodes, 1999-2000)