Terence Fisher’s Frankenstein and the Monster from Hell (1974) marked Hammer Films’ final Frankenstein entry. With Peter Cushing returning as Baron Frankenstein and David Prowse as the creature, this Gothic horror blends asylum madness with Hammer’s trademark atmosphere — closing an era of British horror classics.

The finale to Hammer's Frankenstein cycle features a young Doctor who is interned in the asylum where Baron Frankenstein supposedly perished after being found experimenting on stolen corpses. In the asylum he meets the mysterious Doctor Victor and gradually comes to realise that Frankenstein is alive and well and continuing his work.

Från IMDB:
Baron Frankenstein works with a mental patient to reanimate the dead.