It's another ripsnorter of an episode for Charlie Higson's daft but dapper and thrillingly old-school serial, replete with action, adventure, pleasingly inappropriate levels of violence and monsters that linger in the imagination. Parents whose children are still trying to get over the sheer creepy wrongness of the man-dog thing known as The Harbinger will be pleased to note he's back tonight, as is The Cutter, that big, scary, seething guy with one arm like a huge mutant lobster claw, who we briefly glimpsed in Richard E Grant's prison last week.