A disgruntled phone company employee develops a device whereby those answering a phone can be murdered, and it's up to Nat Bridger to stop the killer.
| Directing | Michael Anderson | Director |
| Writing | Dennis Shryack | Story |
| Production | Stanley Colbert | Executive Producer |
| Writing | James Whiton | Story |
| Sound | John Barry | Original Music Composer |
| Art | Seamus Flannery | Production Design |
| Writing | George Armondo | Story |
| Art | Joyce Liggett | Set Decoration |
| Writing | Dennis Shryack | Screenplay |
| Writing | John Kent Harrison | Screenplay |
| Production | Bob Cooper | Producer |
| Writing | Michael Butler | Story |
| Camera | Reginald H. Morris | Director of Photography |
| Production | Brian Walker | Co-Producer |
| Production | Michael W. Hadley | Associate Producer |
| Editing | Martin Pepler | Editor |
| Writing | Michael Butler | Screenplay |
| Production | Roger Corman | Producer |
