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Smoke Signal (1955)

IMDb: 6.2
1955

A suspected cavalry deserter proves to be resourceful in helping the surviving members of a fort, flee Indians along a dangerous river

The Creature Walks Among Us (1956)

IMDb: 5.8
1956

A scientist captures the Creature and turns him into an air breather, only for him to escape and start killing

This Island Earth (1955)

IMDb: 5.9
1955

Aliens come to Earth seeking scientists to help them in their war