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)