 | Richard Carlson als John Putnam |
 | Barbara Rush als Ellen Fields |
 | Charles Drake als Sheriff Matt Warren |
 | Joe Sawyer als Frank Daylon |
 | Russell Johnson als George |
 | Kathleen Hughes als Jane Dean |
 | Dave Willock als Pete Davis (uncredited) |
 | Alan Dexter als Dave Loring (uncredited) |
 | George Eldredge als Dr. Snell (uncredited) |
 | Edgar Dearing als Sam, a hobo (uncredited) |
 | George Selk als Tom, a hobo (uncredited) |
| Bradford Jackson als Bob, Snell's assistant (uncredited) |
| Robert Carson als Dugan, reporter (uncredited) |
| Whitey Haupt als Perry, a boy (uncredited) |
| Virginia Mullen als Mrs. Daylon (uncredited) |
 | William Pullen als Deputy Reed (uncredited) |
 | Richard H. Cutting als Radio Announcer (uncredited) |
 | Ralph Brooks als Unidentified Posse Man (unconfirmed) |
| Ned Davenport als Man Outside Newspaper Office (unconfirmed) |
| Dick Pinner als Reporter with Dugan (extra) (uncredited) |
| Casey MacGregor als Toby, a Hobo (uncredited) |
| Harry Essex | Screenplay |
| Jack Arnold | Director |
| Bernard Herzbrun | Art Direction |
| Rosemary Odell | Costume Design |
| Herman Stein | Original Music Composer |
| Irving Gertz | Original Music Composer |
| Ruby R. Levitt | Set Decoration |
| Russell A. Gausman | Set Decoration |
| Henry Mancini | Original Music Composer |
| Paul Weatherwax | Editor |
| William Alland | Producer |
| Robert F. Boyle | Art Direction |
| Clifford Stine | Director of Photography |
| Joan St. Oegger | Hairstylist |
| Glenn E. Anderson | Sound |
| Bud Westmore | Makeup Artist |
| Jack Kevan | Special Effects |
| Joseph Gershenson | Music Director |
| Leslie I. Carey | Sound |
| Joseph E. Kenney | Assistant Director |
| Roswell A. Hoffmann | Visual Effects |
| David S. Horsley | Special Effects |
| Ray Bradbury | Story |
| Milicent Patrick | Special Effects |
