Paul tries to convince Frankenstein's fiance (Hazel Court) to leave, but to no avail. Meanwhile, Frankenstein manages to create a monster of true horror (Christopher Lee) but with a damaged brain. The monster manages to escape and kill, forcing Paul to kill it. However, Frankenstein resurrects his creature which ends up killing his creator's mistress Justine (Valerie Gaunt)...
Although the film starts off a bit slowly, once the creature makes it's debut the film transforms into a truly remarkable horror. Wonderfully macabre.