I remember watching this movie in the 90s, so maybe it was made in 80s. There was a creature or alien that travel inside the spaceship. And it kills men in the ship by sucking them through the drainage on the floor
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This does not feature an alien on a spaceship, but the most evocative scene of a man getting sucked down a sump drain and killed is from the generally not very good Amityville: It’s About Time.