Discover
Donald Woods
Captain Bob Dayton
Kathryn Adams
Mary Blake
Robert Armstrong
Lieutenant Ed Carey
Eduardo Ciannelli
Felix Lynx
Jacqueline Dalya
Innis Clair
Billy Halop
Tim Bryant
Reed Hadley
Caddens
Irving Mitchell
R.S. Hinchfield
Edgar Edwards
Henchman Teal [Chs. 3-6]
John Holland
Henchman Hess
Roy Gordon
Maj. Gen. Fletcher [Chs. 1-2, 4, 11-12]
Alex Callam
Capt. Long [Chs. 1-2, 4, 11-12]
Phil Warren
Bakeman [Ch. 4] (as Philip Warren)
Bill Cody Jr.
Jack Hurd
Crew
Dave O'Brien
Stunts
Tom Steele
Stunts
Jerry Jerome
Stunts
Dale Van Sickel
Stunts
Eddie Parker
Stunts
Ken Terrell
Stunts
Crew
Dave O'Brien
Stunts
Tom Steele
Stunts
Jerry Jerome
Stunts
Dale Van Sickel
Stunts
Eddie Parker
Stunts
Ken Terrell
Stunts