Captain Christopher Pike (archive footage) (1 episode)
Frank Mannata
Billy Hayes
Count Enrico
Joe Collins
Lt. (J.G.) Lyman P. Jones
Captain Benteen
Joe Novak
Technical Adviser (Mountain Climber)
Garver Logan
Emmet Crown (1 episode)
Roark Logan (1 episode)
Capt. Christopher Pike (archive footage) (1 episode)
Justin Power
Jeremy Thrallkill (1 episode)
Francis Jerome (1 episode)
Ralph Stuart (1 episode)
Fred Girard (1 episode)
Jim Grayam
(voice) (uncredited)
JoaquĆn Murrieta
Timothy Higgins
Temple Lea Houston (26 episodes)
Sgt. Dane (1 episode)
Sgt. (later Lt.) John H. Fuller
George R. Tweed
Edward "Jocko" Townsend (1 episode)
Jesus
Matt Jameson
Fred Morrow
Guy Gabaldon
Lt. Tom Cantrell
Adam Caulfield
Himself (uncredited)
Sgt. Nico Kantaylis
Captain Bill Ranson
David Martin
Joe Mundy
Frank James
Bless Keough
William A. Fuller
Dick Cannock (1 episode)
Martin Pawley
Thad Anderson
Gordon Grant
Matuwir
Owen Brown
Wesley Jerome Penn (1 episode)
Phil Aubry (1 episode)
Little Dog
Johnny Colt
Prince Haidi
Signalman Andrew 'Canada' Brown
Bill Ainslee
Ben Tyler
Bob Grayson
Edward J. (Ed) Miller
Chad Carnes
Danny Klempner
The Kid
Pappy Creighton