I, Monster

Christopher Lee

Dr. Charles Marlowe / Mr. Edward Blake

Peter Cushing

Frederick Utterson

Mike Raven

Enfield

Richard Hurndall

Lanyon

George Merritt

Poole

Kenneth J. Warren

Deane

Susan Jameson

Diane

Marjie Lawrence

Annie

Aimée Delamain

Landlady

Michael Des Barres

Boy in alley

Ian McCulloch

Man at Bar (uncredited)

Chloe Franks

Girl in Alley (uncredited)