This film will never be broadcast earlier than 2am, even on the really obscure cable channels - it's just that sort of movie. A slow start and plodding middle section are redeemed only by Pleasence, who does his best to enjoy himself as a hard-boiled detective inspector. The only interesting element of this otherwise unremarkable thriller is the 'humanisation' of the monster, a third-generation caveman living in squalor below Russell Square station. It's clear that he still has human emotions, though he can't articulate them. His degradation to a semi-savage is creepy, rather than scary, and the ending inspires none of the cathartic feelings of relief and triumph that horror films usually leave us with.