(in alphabetical order)
(in credits order)
- Andy Kirk(as Andrew Kirk)
- Timothy Barker(as Tim Baker)
- Howard Hughes(archive footage)
- Oscar Millard(archive footage)
- Dick Powell(archive footage)
- John Wayne(archive footage)
- Susan Hayward(archive footage)
- Agnes Moorehead(archive footage)
- Pedro Armendáriz(archive footage)
- William Conrad(archive footage)
- Thomas Gomez(archive footage)
- John Hoyt(archive footage)
- Ted de Corsia(archive footage)
- Lee Van Cleef(archive footage)
- Michael Woulfe(archive footage)
- Sylvia Lewis(archive footage)
Rest of cast listed alphabetically
- June Allyson(archive footage)
- Marlon Brando(archive footage)
- Yul Brynner(archive footage)
- Jim Hansen(archive footage)
- Orrin Hatch(archive footage)
- Ted Kennedy(archive footage)
- James G. Larkin(archive footage)
- William Laurence(archive footage) (as William 'Atomic Bill' Laurence)
- Curtis LeMay(archive footage)
- Joseph Lyon(archive footage) (as Dr. Joseph Lyon)
- Robert Maheu(archive footage)
- Wayne Owens(archive footage)
- Jack Pace(archive footage)
- Norman S. Powell(archive footage)
- Leó Szilárd(archive footage)
- Irma Thomas(archive footage)
- Stewart L. Udall(archive footage) (as Stewart Udall)
- Michael Wayne(archive footage)
- Grant Whitehead(archive footage)
