Michael Murphy
— Narrator
Burkhard Bilger
— Self
Scott Carpenter
— Self (archive footage)
Francis French
— Self
John Glenn
— Self (archive footage)
Cooper Gordon
— Self
Gus Grissom
— Self (archive footage)
Wally Schirra
— Self (archive footage)
Alan Shepard
— Self (archive footage)
John Paul Stapp
— Self (archival footage)
Dana Kilanowski
— Self
David Simons
— Self (archive footage)