How many movies have Doris Bernhardt and William Grefé collaborated on?

They have worked on 3 movies together! Their first movie together was Sting of Death (1966) while their highest rated movie together was They Came from the Swamp: The Films of William Grefé (2016). They have not worked together since They Came from the Swamp: The Films of William Grefé (2016). They are most known for their horror films together.