John Larkin

as Dr. Leonard Michaelson

as Jim Mellott

as Major General Wiley Crowe (32 episodes)

as Col. Broderick (uncredited)

as Foster Drake (1 episode)

as Captain Carraway (1 episode)

as Mark Grainger (17 episodes)

as Chuck Graffer (1 episode)

as Burt Jackson (1 episode), as Jeff Martell (1 episode)

as Jay Fenton (1 episode), as John Kenyon (1 episode), as Otto Olney (1 episode), as Todd Meacham (1 episode)

as Murph (1 episode)

as Self - Narrator(voice)

as Tony's Butler (uncredited)