An astronaut is killed on re-entry to Earth, but his body is seeded with rapidly-gestating aliens.

A backwoods game warden and a local doctor discover that giant leeches are responsible for disappearances and deaths in a local swamp, but the local police don’t believe them.

An outlaw is left for dead by his gang after being shot. A year later, he is released from jail with one thing on his mind: Revenge.