Donald Pleasence as Professor Nolter

Tom Baker as Lynch

Brad Harris as Brian Redford

Julie Ege as Hedi

Michael Dunn as Burns

Scott Antony as Tony

Jill Haworth as Lauren

Olga Anthony as Bridget

Eithne Dunne as Nurse

Lisa Collings as Prostitute

Joan Scott as Landlady

Toby Lennon as Tramp

Richard Davies as Doctor

John Wireford as Policeman

Tony Mayne as Dwarf Tony

Molly Tweedlie as Dwarf Molly

Kathy Kitchen as Midget Kathy

Fran Fullenwider as Fat lady

Lesley Roose as Skinny Lady

Fay Bura as Bearded Lady

Bob Bura as Fire Eater

Orla Pederson as Human Pincushion

Madge Garnett as Monkey Woman

Willie Ingram as Popeye

Esther Blackmon as Alligator Girl

Hugh Baily as Pretzel Boy

Félix Duarte as Frog Boy

Jill Goldston as Girl at Carnival Freakshow (uncredited)