The Mysterious Monsters

Peter Graves

— Himself - Narrator

Peter Hurkos

— Himself

William Stenberg

— Himself

Sidney Walter

— Himself (as Dr. Sidney Walter)

Jerilou Whelchel

— Herself

Roger Patterson

— Archive Footage

Peter C. Byrne

— Self

Grover Krantz

— Self

Adrian Shine

— Loch Ness Investigator

Robert W. Morgan

— Self

John Green

— Self