S2 E09 - Chapter Twenty Two: Silent Night, Deadly Night
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Riverdale: Every Movie That Inspired The Episode Titles

22. S2 E09 - Chapter Twenty Two: Silent Night, Deadly Night
Silent Night, Deadly Night (1984) - A traumatized young man whose parents were murdered when he was young goes on a deadly rampage dressed as Santa Clause. On Riverdale, it is revealed that Joseph Svenson was the man under the hood. It is also revealed that he is Joseph Conway, a man whose parents were murdered in front of him when he was a child.