 | Brian Donlevy als Stefan Dubechek aka Steve Dangos |
 | Ann Richards als Anna O'Rourke Dangos |
 | Walter Abel als Howard Clinton |
 | John Qualen als Anton Dubechek |
 | Stephen McNally als Teddy Roosevelt Dangos / Narrator |
 | Mary McLeod als Katina 'Tina' Dangos |
| Bob Lowell als George Washington Dangos |
 | Erville Alderson als Olson - Detroit Auto Works Technician (uncredited) |
 | Fred Aldrich als Assembly Line Worker (uncredited) |
 | Axel Anderson als Immigrant (uncredited) |
 | Charles Bates als Teddy Roosevelt Dangos - Age 8 (uncredited) |
 | Byron Foulger als High School Principal (uncredited) |
 | Noreen Nash als Vaudeville act (uncredited) |
| Sue Moore als Minor Role (uncredited) |
| A. Arnold Gillespie | Special Effects |
| King Vidor | Story |
| King Vidor | Producer |
| Cedric Gibbons | Art Direction |
| Ben Libizer | Makeup Artist |
| Douglas Shearer | Recording Supervision |
| Louis Gruenberg | Original Music Composer |
| William Ludwig | Screenplay |
| King Vidor | Director |
| Harold Rosson | Director of Photography |
| John Cooney | Electrician |
