Cy Jordan
Steve Bancroft
Art Shields
Dr. Larry Freeman
Tom
Pete Sloane
Prof. Warren Miller
Zack Taylor
Tim Cordell
Mark Selby
Sparky's Owner
Self (archive footage)
Gus Brody
Self - Host
Paul Fabiani
Kevin Gilmore
Ned Harkness
Miss American Miss Host
Governer Denton
Lt. Ray Phillips
Bob
Self (archive footage) (uncredited)
Dave Adams
Howard Heston
Mark Gaynor
Ken Davis
Henry Lockman
Victor Buckley
Self
Larry Germaine
Richard Lowell
Rip Riddle
Dar-L
George Adamson
Hugh Briant
Alex Tanner
Colonel Vasily Zuchov
Himself
Gary Collins
Sheriff Beal
Garrett O'Brien
Prof. James Fairgate
Mr. Diller
Bill Jordan / Joey Lee / Michael, Angel of Death
Skip Connors
Dewey Morgan