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"Nightmare at 20,000 Feet" is a 1963 episode of the American television anthology series The Twilight Zone, based on the short story of the same name by Richard Matheson.

Bob Wilson (William Shatner) is a salesman on an airplane who notices a gremlin on the wing of the plane during mid-flight. Bob tries to alert his wife and the flight crew to the gremlin's presence, but every time someone else looks out the window, the gremlin leaps out of view, so nobody believes Bob's seemingly outlandish claim; his credibility is further marred by the fact that this is his first flight since his nervous breakdown six months earlier, which also occurred on a plane. Bob realizes that his wife is starting to think he needs to go back to the sanitarium, but his bigger concern is that, if nothing is done about the gremlin, it will damage the plane and cause it to crash; in fact, the gremlin has already started to tinker with the wiring under one of the wing flaps.

After repeated attempts to warn the crew, Bob grows desperate, steals a sleeping policeman's revolver, and opens the window marked "Auxiliary Exit" to shoot the gremlin, succeeding despite the fact that he is nearly blown out of the plane himself. Once the plane has landed, Bob is whisked away in a straitjacket, as everyone believes that he has gone insane; however, the narrator informs the viewers that Bob's stay will be short-lived, and the final shot reveals why: The gremlin has left evidence of Bob's story, in the form of the damaged wing.

The episode was remade in 1983, as a segment of Twilight Zone: The Movie. Unlike Bob Wilson, whose credibility was compromised by a recent nervous break-down in the 1963 version, John Valentine, played by John Lithgow, suffers from severe aviatophobia, again giving the flight crew added reason to disbelieve his wild claims.

Gremlin (The Twilight Zone) has not been a contender in any CBUB matches.