Sadly, after a promising start in Hell where spectral child-murderer Freddy Krueger is trying to escape with the aid of Jason, the hockey-masked mutant from Friday the 13th - and one or two witty inserts such as the hookahsmoking caterpillar from Alice in Wonderland - Ronny Yu's movie degenerates into a retro slasher pic that simply piles on the gore and severed limbs until boredom sets in.