The waters surrounding an island become contaminated by chemical dumping, and people who eat fish caught in those waters become deformed and violent.
Ian Bannen
as Dr. Shaw
Judy Geeson
as Victoria Brown
John Paul
as Dr. Quist
George Sanders
as The Admiral
Simon Oates
as Dr. Ridge
Jean Trend
as Dr. Fay Chantry
Joby Blanshard
as Bradley
Percy Herbert
as Hartwell
Shelagh Fraser
as Mrs. Betty Straker
Geoffrey Keen
as Sir Henry Leyton
Joseph O'Conor
as Vicar
Norman Bird
as Brewer
