A Scotland Yard Detective must investigate a series of murders perpetrated by a giant blood-sucking moth that can take human form.
Peter Cushing
as Detective Inspector Quennell
Robert Flemyng
as Dr. Carl Mallinger
Wanda Ventham
as Clare Mallinger
Glynn Edwards
as Sgt. Allan
Kevin Stoney
as Granger the Butler
Vanessa Howard
as Meg Quennell
David Griffin
as William Warrender
Roy Hudd
as Morgue Attendant
William Wilde
as Frederick Britewell
Simon Cain
as Clem Withers
Russell Napier
as Landlord
John Paul
as Mr. Warrender
