Charles Bronson
(John Strock),
Vincent Price
(Robur),
Don Ames
(Man at Balloon Society Meeting),
Peter Besbas
(Wilson),
Jimmie Booth
(Man at Balloon Society Meeting),
Wally Campo
(Turner),
David Frankham
(Phillip Evans),
Richard Harrison
(Alistair),
Al Haskell
(Man at Balloon Society Meeting),
Henry Hull
(Prudent),
Michael Jeffers
(Man at Balloon Society Meeting),
Gordon Jones
(Talkative Morgantown Townsman),
Ray Jones
(Man at Balloon Society Meeting),
Steve Masino
(Weaver),
Loretta Nicholson
(Morgantown Townswoman),
William H. O'Brien
(Prudent's Butler),
Vito Scotti
(Topage),
Mary Webster
(Dorothy Prudent)