It's about a killer lab cat who terrorized a bunch of people on a small cruise ship. Here's its Wikipedia page:
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This movie is AMAZING!!!! It has George Kennedy and a killer radioactive kitty with a monster kitty (played by a leftover puppet from the movie Hobgoblins... no, seriously!) that jumps out of the normal kitty's mouth all Alien-style. If you're having a hard time picturing this, check out the exciting climax here on Youtube: https://www.youtube.com/watch?v=WcqGsYhJcXI
Riff this because:
1) really, really laughably bad special effects involving multiple cat puppets
2) The premise is so absurd it's like the filmmakers are challenging audiences to riff this
3) once great stars looking really silly (and kind of sad) as they cringe in terror from an adorable kitty/super LB cat puppet
4) so so many 80s stereotypes, from douchey Gordon Gecko wannabe to a "sexy" babe with hair so teased you just know that it needed years of therapy to learn to love itself again.
5) It takes place on a yacht!
Please please please riff this one. It's got Gorge Kennedy being murdered by a cat puppet that comes out of the mouth of another (even less believable) cat puppet. The cat puppet^2 then goes on a murder rampage aboard a yacht populated by approximately every 1980s stereotype! This begs to be riffed!!! It only took two cat puppets and a massive amount of cocaine to make this film, but a RiffTrax treatment will turn this turd into pure gold!
Oh man this movie stinks. Wasn't sure what the puppet in the cats mouth was, but the anonymous poster is right, it's an old puppet from Hobgoblins.
This ranks right up there with "Hobgoblins" and "To Catch a Yeti" as having the fakes looking puppet in existence. This movie was MADE for Rifftrax.
I was going to suggest this movie. It's great, and written and directed by Greydon Clark, the genius who gave us the MST3k movies Angels' Revenge and Final Justice. Words alone can't do this hilariously awful movie justice.
Not only does this "star" George Kennedy and Clu Gulager, it was produced by Greydon Clark and features a puppet from Hobgoblins.
Christopher Robert Williams commented
It is about a killer mutant cat monster that hides inside a normal house cat. When the host cat is threatened or upset, the mutant cat (it's about the size of a Rottweiler) climbs out of the house cat's mouth, kills the offending people, and then climbs back into its house cat shell. The Cat is found by some "sexy" teen girls who are invited on to a Yat party and bring the cat along.