"The Curious Case of Edgar Witherspoon" is the thirty-sixth episode and the first episode of the third season (1988–89) of the television series The Twilight Zone.

Dr. Jeremy Sinclair, a psychiatrist at a mental hospital, is visited by the niece and the landlady of Edgar Witherspoon. They are concerned with his increasingly bizarre behavior, namely his obsession with seemingly insignificant items from other people. Edgar has also holed himself up in his apartment, refusing to let anyone else inside. Sinclair agrees to help Edgar and visits his apartment the next day. He finds Edgar frantically searching for a doll's head, claiming that Santa Barbara will fall into the ocean if it isn't found in five minutes. Edgar rushes back into the apartment but apologizes to the doctor for his rudeness and shuts the door in his face.

Sinclair overhears a radio bulletin about an earthquake in Santa Barbara. He returns to the apartment, forcing Edgar to let him inside. Sinclair discovers that the apartment is filled with a gigantic, intricately designed contraption made up of a huge amount of odds and ends. Edgar tries to explain his behavior by comparing the world to a clock that needs small adjustments in order to continue; under direction from a mysterious voice only he can hear, Edgar adds items to his "creation" in order to keep the world "from falling off its perch." Sinclair has Edgar taken in for observation, but Witherspoon struggles, claiming that he can't leave his machine alone or the world will go "poof." During their fight, Sinclair accidentally dislodges a few paper clips from the device and Edgar panics. As mental hospital affiliates lead Edgar away, he shouts back to Sinclair that an island nation in the Pacific has ceased to exist because of the disruption - and Jeremy is to blame.

Though Sinclair ignores this warning at first, he realizes that Edgar has been correct all along when he hears a news bulletin announcing that the Pacific island Witherspoon named was destroyed by a tsunami at the exact moment the paper clips came loose. Jeremy also bolts from the hospital when he remembers that he gave Witherspoon's landlady permission to destroy the device; as he runs out, he gives the order for Edgar to be released. Sinclair arrives just as the landlady is about to take a broom to Edgar's machine, and begs her to let it remain standing by claiming that he needs to observe it to better understand Witherspoon's delusions. The landlady agrees, but only after Sinclair offers to pay double the current rent.

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