

The waters surrounding an island become contaminated by chemical dumping, and people who eat fish caught in those waters become deformed and violent.
Practical Effects
Grotesque fish-man makeup that still slaps five decades later.
Direction
Sasdy squeezing genuine dread from foggy docks and hostile locals.

Director
Peter Sasdy
Trivia, insights & behind the scenes
Spun off from a BBC series that actually influenced real UK environmental policy — rare case where TV sci-fi had legislative teeth.