Night of the Creeps

In 1959, on board a spacecraft, two aliens race to keep an experiment from being released by a third member of the crew. The seemingly possessed third alien shoots the canister into space where it crashes to Earth. Nearby, a college man takes his date to a parking spot when they see a Meteoroid and investigate. It lands in the path of an escaped criminally insane mental patient. As his date is attacked by the axe-wielding maniac, the boy finds the canister, from which a small slug-like thing jumps out and into his mouth.