Character Name : Charles Keith

Original Name : Gregory Peck

Gender : Male

Character Name : Jim Pruett

Original Name : Richard Crenna

Gender : Male

Character Name : Ted Dougherty

Original Name : David Janssen

Gender : Male

Character Name : Clayton Stone

Original Name : James Franciscus

Gender : Male

Character Name : Buzz Lloyd

Original Name : Gene Hackman

Gender : Male

Character Name : Celia Pruett

Original Name : Lee Grant

Gender : Female

Character Name : Teresa Stone

Original Name : Nancy Kovack

Gender : Female

Character Name : Betty Lloyd

Original Name : Mariette Hartley

Gender : Female

Character Name : Public Affairs Officer

Original Name : Scott Brady

Gender : Male

Character Name : Air Force Systems Director

Original Name : Frank Marth

Gender : Male

Character Name : Flight Director

Original Name : Craig Huebing

Gender : Male

Character Name : Flight Surgeon

Original Name : John Carter

Gender : Male

Character Name : Aerospace Journalist

Original Name : Vincent Van Lynn

Gender : Male

Character Name : Mission Director

Original Name : George Gaynes

Gender : Male

Character Name : Houston Cap Com

Original Name : Tom Stewart

Gender : Male

Character Name : Air Force Titan Specialist

Original Name : Duke Hobbie

Gender : Male

Character Name : Network Commentator

Original Name : Walter Brooke

Gender : Male

Character Name : Launch Director

Original Name : Dennis Robertson

Gender : Male

Character Name : Guest in Observation Room (uncredited)

Original Name : Kenner G. Kemp

Gender : Male