Elenco - X-15
David McLean
Matt Powell
Charles Bronson
Lt. Col. Lee Brandon
Mary Tyler Moore
Pamela Stewart
Stanley Livingston
Mike Brandon
Ralph Taeger
Maj. Ernest Wilde
Brad Dexter
Maj. Anthony Rinaldi
Kenneth Tobey
Col. Craig Brewster
James Gregory
Tom Deparma
Patricia Owens
Margaret Brandon
James Stewart
Himself / Narrator (voice)
Lisabeth Hush
Diane WildeLauren Gilbert
Col. JessupFrank Watkins
Security Policeman
Dick Wilson
Flight Engineer