Naked Space
Also known as "The Creature Wasn't Nice" and "Spaceship", this movie was intended to be a parody of the now classic movie Alien. It starred Leslie Nielsen, during a time when his popularity was waning and he was seemingly taking any role he could.
This movie is so terrible that showing it to someone has to be considered a form of cruel and unusual punishment. I eagerly showed it to a friend after discovering a cheap copy of it and kept reassuring my friend - and myself - that it would eventually get funny. It never did.
I actually had to look up the plot since it did such a horrible job at accomplishing its storytelling task that all I can remember from the movie is wanting to set the disk on fire. I instead left it at my friend's house and she threatened me that I better take it back if I wanted to remain friends.
"When the spaceship Vertigo stops to explore a previously unknown planet, the crew finds an unrecognized dollop of protoplasm and takes it aboard ship to return it to earth for analysis. On board, lifeform expands into an oozing person-eating monster which communicates primarily by means of a Vegas lounge act. The crew is gobbled up one after another until the two surviving crewmembers come up with a plan."
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Bob Ward commented
A must-riff!