Now here's what cheap sci-fi teen horror is all about, and it's from AIP, of course! Astronaut is killed in space while possessed by an evil alien force, but somehow his severed arm makes its way to earth, still hosting the alien, and begins a killing spree. If that's not good enough, you've got troubled teens, two proto-X-Files scientists tracking the hand, a sublimely weird malt-shop assault scene, and the crawling arm's demise comes via a pack of stray cats! Classic trash from start to finish!
Review of The Crawling Hand
