Uninvited. Greydon Clark, 1987.
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Edition screened: Vinegar Syndrome Blu-ray #259, released 2019. English language. Runtime approximately 91 minutes.
Summary: A domestic house cat has escaped from an animal experimentation laboratory. He finally is cornered, and at 3:08-3:35 is shot with a tranquilizer dart before a mutant monster cat emerges from the mouth of an obviously fake dummy cat.
The orange house cat who is the star of this movie does a great job. A few times he obviously is annoyed from being chased around and passed back and forth, but we do not see him mishandled or particularly tormented after being shot with the tranquilizer dart mentioned above.
There are numerous closeup scenes of a rather ridiculous dummy cat head and the slimy cat monster that comes from its ridiculous-looking mouth.