A series of grisly murders plague a small mountain community and the sheriff suspects a local scientist whom he dislikes. Together with a former professor and the professor's pretty daughter, the scientist sets about solving the crimes and discovers the killer is an oversized 16th century conquistador, resurrected by a lightning bolt from his mountain grave.
You can now watch Giant from the Unknown online on the following streaming providers in the United States.
| Directing | Richard E. Cunha | Director |
| Production | Arthur A. Jacobs | Producer |
| Sound | Albert Glasser | Original Music Composer |
| Camera | Richard E. Cunha | Director of Photography |
| Production | Marc Frederic | Associate Producer |
| Costume & Make-Up | Marjorie Corso | Costume Design |
| Costume & Make-Up | Grace Kuhn | Costume Design |
| Costume & Make-Up | Jack Pierce | Makeup Artist |
| Crew | Harold Banks | Special Effects |
| Writing | Frank Hart Taussig | Screenplay |
| Writing | Ralph Brooke | Screenplay |
| Writing | Ralph Brooke | Story |
| Writing | Frank Hart Taussig | Story |
