| Cast member | - Fred Ward (Virgil I. "Gus" Grissom, Gus Grissom)
- Dennis Quaid (Gordon "Gordo" Cooper, Gordon Cooper)
- Ed Harris (John Glenn, John Glenn)
- Scott Glenn (Alan Shepard, Alan Shepard)
- Sam Shepard (Chuck Yeager, Chuck Yeager)
- Barbara Hershey (Glennis Yeager)
- Lance Henriksen (Walter "Wally" Schirra, Wally Schirra)
- Veronica Cartwright (Betty Grissom, Betty Grissom)
- Jane Dornacker (Nurse Murch)
- Harry Shearer (NASA recruiter)
- Jeff Goldblum (NASA recruiter)
- Kim Stanley (Pancho Barnes, Pancho Barnes)
- Pamela Reed (Trudy Cooper)
- Mary Jo Deschanel (Annie Glenn, Annie Glenn)
- Donald Moffat (U.S. Senator and Vice President Lyndon B. Johnson, Lyndon B. Johnson)
- Scott Wilson (Scott Crossfield, Albert Scott Crossfield)
- David Clennon (a liaison man)
- Kathy Baker (Louise Shepard, Alan Shepard)
- John P. Ryan (the Head of the Manned Space Program)
- William Russ (Slick Goodlin, Chalmers Goodlin)
- Levon Helm (Jack Ridley, Jack Ridley)
- Anastas Mikoyan (himself, Anastas Mikoyan)
- Bill Dana (José Jiménez, José Jiménez)
- Ed Sullivan (himself, Ed Sullivan)
- Georgy Malenkov (himself, Georgy Malenkov)
- John Dehner (Henry Luce, Henry Luce)
- John F. Kennedy (himself, John F. Kennedy)
- Kliment Voroshilov (himself, Kliment Voroshilov)
- Lyndon B. Johnson (himself, Lyndon B. Johnson)
- Nikita Khrushchev (himself, Nikita Khrushchev)
- …
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