Dr. Morgan and Dr. Cavigny star as a brace of scientists who return from the West Indies with a potent, phosphorescent serum that allegedly changes human beings into cats.
Eduardo Ciannelli
as Dr. Van Glock
Onslow Stevens
as Dr. Jim Borden
June Vincent
as Gwen Runstrom
Ralph Morgan
as Dr. Lester Cavigny
Janis Wilson
as Nora Cavigny
John Baragrey
as Dr. John Reade
Richard Lane
as Insp. Fenwick
Philip Ahn
as Ah Wong - Restaurant Owner
Lotte Stein
as Nurse Maidie Halpern
Ralph Peters
as Workman
David Hoffman
as Andre Dussaud
John George
as Waiter
