Jackie Cooper
Kurt Anderson
Monte Markham
Eddie Reese / Col. Brice Randolph
Richard Anderson
Dr. Wylie
Robert Lansing
John Phillips
Susan Clark
Gail Randolph
John Lupton
Don Masters
Walter Brooke
Tom Everett
James B. Sikking
Astronaut Higgins
Paul Kent
Carl Samuels
Loretta Leversee
Toni Scott
Ray Dimas
Freddie
Patsy Garrett
Boy's Mother
Tom Hallick
Agent Wilson
John S. Ragin
Walters
Paul Micale
Beachgoer
Richard Stahl
Fred, Beachgoer's Friend
Bob Harks
Photographer (uncredited)