Fan theory lays out the evidence for why Dennis Reynolds might be a serial killer

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Over the years, the gang on It’s Always Sunny In Philadelphia have evolved in different ways. Charlie’s surprising ingenuity and illiteracy have become more prominent, Dee has tried to break off from her friends and get some independence, and Mac has begun to question everything he thinks he knows about himself, but Glenn Howerton’s Dennis Reynolds has just gotten more and more unsettling the longer the show goes on. He started as a fairly self-obsessed creep, but as seen in this supercut from a few years ago, he has gradually transformed into a straight-up sociopath who only cares about his friends when it suits his needs. In a sense, he has become the villain of the show.