Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
- John Agar as Prof. Clete Ferguson
- Lori Nelson as Helen Dobson
- John Bromfield as Joe Hayes
- Nestor Paiva as Lucas
- Grandon Rhodes as Jackson Foster
- Dave Willock as Lou Gibson
- Robert Williams as George Johnson
- Charles Cane as Police Captain
- Ricou Browning as Gill-Man (Underwater)
- Tom Hennesy as Gill-Man (Land)
- Patsy Lee Beery as Girl Necking in Car
- Clint Eastwood as Lab Technician