Craig Stevens

as Frank Poston

as Cyrus Hampton

as Prof. Ames Caulfield (1 episode)

as Carter

as Craig Chase (1 episode), as James Chelton (1 episode)

as Willard

as Henry 'Hank' Rogers (1 episode)

as Bill McClure

as Greg Stewart (2 episodes)

as Lawrence Henry Carroll III (1 episode)

as Viktor Lukas (2 episodes), as Frank Pearse (1 episode), as Hakim (2 episodes)

as Asher Berg (12 episodes)

as Jonathan Kendrick (1 episode)

as Walter Healy (1 episode)

as Walter Carlson (13 episodes)

as Nick Charles

as Saunders (1 episode)

as Ben Ryerson (1 episode)

as Rudolf van Bohlen

as Stuart Reynolds

as Thorpe (1 episode)

as Charles Corman

as Brett (1 episode)

as Mr. Sloan (1 episode)

as Julian Carpenter (1 episode)