Michael Conrad, owner of a group of strange animals, trains his beasts to obey him, unleashing them on anyone who stands in his way. His wife and mute assistant begin to suspect that they too are becoming part of the black zoo.

Michael Gough
as Michael Conrad

Jeanne Cooper
as Edna Conrad

Rod Lauren
as Carl

Virginia Grey
as Jenny Brooks

Jerome Cowan
as Jerry Stengel

Elisha Cook Jr.
as Joe

Edward Platt
as Chief Rivers

Douglas Henderson
as Lt. Mel Duggan

Marianna Hill
as Audrey

Byron Morrow
as Coroner