Charlie Englehardt

Lloyd Bridges

Astronaut Capt. Rick Lawrence

Jeremy Slate

Eli Mackernutt, Sr.

Edward Faulkner

Hans Hartman

Jon Cedar

Mrs. Mary Mackernutt

Barbara Faulkner

Joey Williams

Stephen Rogers

Astronaut Ben Pelham

Jim McMullan

Astronaut Dave Anderson

Morgan Paull

Eli 'E.J.' Mackernutt, Jr.

Michael Link

Jacob Avril

John Carradine

Dr. Jack Smathers

Jack Callahan

Himself

Charles Conrad

Whitehead

Walter Brooke

Tom Estes

Keene Curtis

Director

Andrew V. McLaglen

Writer

Jon Boothe

Art Direction

Allen E. Smith

Original Music Composer

Patrick Williams

Director of Photography

J.J. Jones

Producer

John Cutts

Editor

John F. Schreyer

Novel

William R. Shelton

Associate Producer

Carl Kugel

Unit Production Manager

Maurie M. Suess

Production Supervisor

Mark Evans

Set Decoration

Robert De Vestel

Music Supervisor

Lionel Newman

Special Effects

Joe Zomar

Casting

Jack Baur

Post Production Supervisor

Joseph Silver

Assistant Director

Jack Barry

Technical Advisor

Joe W. Schmitt