Konga

Michael Gough

— Dr. Charles Decker

Margo Johns

— Margaret

Jess Conrad

— Bob Kenton

Claire Gordon

— Sandra Banks

Austin Trevor

— Dean Foster

Jack Watson

— Supt. Brown

George Pastell

— Professor Tagore

Vanda Godsell

— Bob's Mother

Stanley Morgan

— Inspector Lawson

Grace Arnold

— Miss Barnesdell

Leonard Sachs

— Bob's Father

Nicholas Bennett

— Daniel

Kim Tracy

— Mary

Rupert Osborne

— Eric Kenton

Steven Berkoff

— Student on Field Trip (uncredited)