David Cronenberg’s become quite respectable with age (despite his penchant for naked Viggo Mortensen fights and hints of ultra-violence), so digging into his first commercial feature can be a little unsettling. This is cheap and sleazy stuff, with that frayed ’70s film stock and harsh, green-tinted lighting of the best drive-in trash. But underneath it is Cronenberg’s obsession with bodily change and image, and his darkest sense of humor — the stuff that would be made perfection in his adaptation of The Fly. It’s really about slugs that get in your body and make you horny. So yeah, pure Cronenberg.