"Returning to the series after the misfire of Horror Of Frankenstein (1970), Terence Fisher turns in one of his finest works. He makes virtue of a minuscule budget by crafting a deeply claustrophobic piece. The image is heavy on greys and browns, Brian Probyn's cinematography almost radiating stench and decay. Cushing's final outing as Frankenstein is quite simply inspired. To paraphrase philosopher George Santayana, the Baron has become the definition of a fanatic, re-doubling his efforts long after he has lost sight of his original objective. The Baron of old is still visible, lurking in there somewhere, but the sparkling enthusiasm of the young and eager medical student has been replaced by something cold, world weary, methodical and calculating." - Richard Phillips-Jones, The Spooky Isles