S2 E05 - Chapter Eighteen: When a Stranger Calls
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Riverdale: Every Movie That Inspired The Episode Titles

18. S2 E05 - Chapter Eighteen: When a Stranger Calls
When A Stranger Calls (1979) - A deranged killer terrorizes a baby sitter with menacing calls. Later, she learns that the calls are coming from inside the house. On Riverdale, The Black Hood begins terrorizing her with phone calls.