The calving of an Arctic iceberg releases a giant praying mantis, trapped in suspended animation since prehistoric times. It first attacks military outposts to eat their occupants, then makes its way to the warmer latitudes of Washington and New York. A paleontologist works together with military units to try to kill it.
| Production | William Alland | Producer |
| Writing | William Alland | Story |
| Art | Robert Clatworthy | Art Direction |
| Directing | William Holland | Assistant Director |
| Visual Effects | Clifford Stine | Visual Effects |
| Art | Alexander Golitzen | Art Direction |
| Art | Russell A. Gausman | Set Decoration |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Art | Oliver Emert | Set Decoration |
| Sound | William Lava | Original Music Composer |
| Directing | Nathan H. Juran | Director |
| Writing | Martin Berkeley | Screenplay |
| Sound | Irving Gertz | Original Music Composer |
| Editing | Chester W. Schaeffer | Editor |
| Camera | Ellis W. Carter | Director of Photography |
| Costume & Make-Up | Jay A. Morley Jr. | Costume Design |
