The interesting thing about Teenage Caveman is that it yokes a Z-grade post-apocalyptic sci-fi screenplay of no real distinction to the naked-teenaged-orgy sensibility of Larry Clark, the director of Kids and Bully. The resulting film would have been quite something to stumble across on pay cable in the middle of the night.

I’ll be damned if, for the first 45 minutes or so, Clark doesn’t actually make something of this mess, which has to do with some kids who’ve been forbidden from having sex by a self-styled Messiah who really wants the nubile young girls all to himself. An old dude’s been impaled on a “No Skateboarding” sign before the credits finished rolling, and the centerpiece of the film is a tour de force that begins with all of the characters stripping off their clothes and getting into a hot tub before culminating in one of the most disgusting (and terribly funny) sequences I’ve seen lately. It could best be described as “explosive.” If this sounds like the sort of thing you’d enjoy, then it probably is (you sick little twist, you).

The main problem is that Teenage Caveman shoots its wad fairly early and then goes straight downhill, falling into that trap of no-budget SF-horror outings — it becomes a gabfest, with characters standing around talking about their dastardly histories and their nefarious plans for the future. Like a real trouper, Tara Subkoff gets naked again in an attempt to save the final reel, but despite some special effects that probably chewed up half the film’s budget, it just dies on the screen.