Detective Inspector Quennell

Peter Cushing

Dr. Carl Mallinger

Robert Flemyng

Clare Mallinger

Wanda Ventham

Meg Quennell

Vanessa Howard

Sgt. Allan

Glynn Edwards

Granger the Butler

Kevin Stoney

Smiler

Roy Hudd

William

David Griffin

Mr. Warrender

John Paul

Frederick Britewell

William Wilde

Landlord

Russell Napier

Clem Withers

Simon Cain

Chief Constable

Robert Cawdron

James

Kenneth Colley

Second Porter

Roy Evans

Coachman Joe Trager

Leslie Anderson

Cook

Joan Ingram

Student with Toy Spider

David Lyell

Constable Smith

Drew Russell

Snaflebum

John Scott Martin

First Porter

William Maxwell

Police Doctor

Norman Pitt

Starkadder

Robin Wentworth