Brig. Gen. Robert O'Brien
Emir Hassan
Dr. Franz Edelmann
Sam Bellows
Dr. Matt Higgins
Igor Braun
Dr. Walters
Johnny Achilles
Jack Lestrade
Rudolph Von Preissing
Pecos Kane
John Grayson
Brock Danvers
Dr. Roy Stark
John P. Tedesco
Hearn
Field
J. Stanley McMasters
George Harland
Guy Polli
Lt. Dearborn
Dr. John Kendrick
Dr. W.L. Janz, M.D.
Aramis
Chief Agent Alec Conrad
Dr. Franz Edlemann (archive footage)
Frank Faber
Sir Gerald 'Jerry' Markham
Stanley Stanfield
Jayda McQueen
Dr. Frank Norton
Ellis
Holden
Mr. Nickerson
Grover Johnson
Dan 'Ace' Cartwright / Henry Mathews
Walter Van Runkle
Nate Girard
Cmdr. James McLean
Don Phillips
Steve Nichols, alias Steve Cummings
Carl Cutler
Professor Brandt
Prof. John Applegate
Dan Adams
Jeffrey 'Jeff' Powell
Counsellor Doone
Bob Dunbar
Jim Summers
Dr. Joel Becker
Judge Williams
Tom Hannegan
Walter
Dr. Jim Borden
Mr. Shaw
John Hawley
Jack Hanway
Dr. Foster
Prince Michael
Joe Baldwin
Lyn Durland
Tom Crosby
Frederick Keller
Richard Evans
Capt. Jim Martin
Farraday
Gen. de la Garance
Lawrence Vail
Bob Stevens
Gregg Jackson
Col. Ethan Waters
Lugal
Attorney Palmer
Francis Scott Graham
Joshua Davis
Barnard
Mr. Lassiter
Calvin Brown
Gen. Nathan Keller
Henchman (uncredited)
Mr. Wendi
Harry Rogers
Self (archive footage)
Carl Hughes
Captain Allen
Judge Dana Culver
Ben Goddard
Scott Varnum
Sheriff Adler
Sam Houston
Roger Morrow
Flint Johnson
Richter
Kowland
Hannibal Pardee
Col. Daniel Morgan Benedict II
Jack Hanford