William Christopher

as Self

as Himself

as Professor Roykirk (1 episode)

as Priest

as Art Amador / Martin Beckman (1 episode)

as Andrus (1 episode)

as Chaplain Olson (1 episode)

as Self / Father Mulcahy

as Harvey Allen (1 episode)

as Bjørn (voice)

as Burton Hollis (1 episode)

as Father Mulcahy (31 episodes)

as Self

as Barton

as Carl Mitchell (1 episode), as Elliot Weatherly (1 episode), as Hal Wiliston (1 episode)

as Bank Teller

as Self (1 episode)

as The Doctor (1 episode)

as Father Mulcahy (218 episodes)

as Niles (4 episodes)

as Male Scientist (1 episode)

as Zip (Cloud)

as Hotel Manager (uncredited)