The Redeemer: Son of Satan!
We know this movie as Class Reunion Massacre. It is wonderfully awful from top to bottom. The redeemer is a priest who is killing old classmates for their sinful lives thanks to the supernatural 3rd thumb he magically sprouts after being visited by a boy that came out of a lake. Oh ya, the priest also has an adult sized marionette doll helping him redeem the sinners. Everybody we have made watch this movie has come away with completely different interpretations of the movie. Even if you don't riff it, you really need to check it out!
There are A LOT better images from the movie that I could think of to post here but these are all I found.
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Andy in NJ commented
Some people call this a misunderstood cult classic,but not me. This movie practically begs to be riffed