Gregory Peck
Charles Keith
Richard Crenna
Jim Pruett
David Janssen
Ted Dougherty
James Franciscus
Clayton Stone
Gene Hackman
Buzz Lloyd
Lee Grant
Celia Pruett
Nancy Kovack
Teresa Stone
Mariette Hartley
Betty Lloyd
Scott Brady
Public Affairs Officer
Frank Marth
Air Force Systems Director
John Carter
Flight Surgeon
George Gaynes
Mission Director
Duke Hobbie
Air Force Titan Specialist
Walter Brooke
Network Commentator
Kenner G. Kemp
Guest in Observation Room (uncredited)
Craig Huebing
Flight Director
Vincent Van Lynn
Aerospace Journalist
Tom Stewart
Houston Cap Com
Dennis Robertson
Launch Director
