Night of the Blood Beast (1958)

Synopsis
The familiar rocks and rills of LA's Bronson Caverns are seen to good advantage in Night of the Blood Beast. The story begins when a manned space rocket develops trouble and plummets back to earth, apparently killing its occupant, Major John Corcoran (Michael Emmet). Unfortunately, Corcoran's body has become a breeding ground of extraterrestrial embryos, picked up while the rocket was in outer space. The tiny monsters grow and multiply, and before long Corcoran revives from the dead, literally impregnated by the alien beasts. After this promising and decidedly unorthodox buildup, the film goes downhill, settling for standard eek-eek shocks and a most unconvincing "blood beast", whose costume wouldn't have even passed muster at a Halloween party. Still, Night of the Blood Beast is at least half of a good, well-constructed horror flick. ~ Hal Erickson, All Movie Guide