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A gremlin is a mythological mischievous creature. Gremlins are depicted as mechanically oriented and extremely devious. The word "gremlin" could come from Old English grëmian, meaning, "to vex" or, "to anger", from grim, "severe" (further information about grim found in a dictionary containing the full etymology), and related to German grämen and Swedish gräma, "to grieve". Another explanation is the combination of Grimm's Fairy Tales and Fremlins - the only beer available to airmen at the time.
The concept of the Gremlins as responsible for sabotaging aircraft is said to have originated in a tale told among men of the Royal Air Force of the United Kingdom serving in the Middle East during World War II. The story attempted to explain the accidents which often occurred during their flights.
The lore of the gremlin was reportedly told to Roald Dahl by colleagues of his in the 80th squadron of the Royal Air Force during his own service in the Middle East. Dahl had his own experience in an accidental crash-landing in the Libyan Desert. He was believed to have recovered and briefly resumed serving in Greece and Syria but his frequent headaches soon caused him to be relieved of active duty. In January, 1942 he was transferred to Washington, DC as Assistant Air Attache. There he eventually authored his novel The Gremlins, in which he described male gremlins as "widgets" and females as "fifinellas". He showed the finished manuscript to Sidney Bernstein, the head of the British Information Service. Sidney reportedly came up with the idea to send it to Walt Disney.
The manuscript arrived in Disney's hands in July, 1942 and he considered using it as material for a film. The film project never materialised but Disney managed to have the story published in the December, 1942 issue of Cosmopolitan magazine. About half a year later a revised version of the story was published in a picture book published by Random House. The book is going to be republished in 2006 by Dark Horse Comics. Thanks mainly to Disney, the story had its share of publicity which helped in introducing the concept to a wider audience. Issues #33-#41 of Walt Disney's Comics and Stories published between June, 1943 and February, 1944 contained a nine-episode series of short silent stories featuring a Gremlin Gus as their star. The first was drawn by Vivie Risto and the rest of them by Walt Kelly. This served as their introduction to the comic book audience.
It was at this point Robert Clampett created his 1943 Bugs Bunny film, Falling Hare. With Disney's film never materialising, this short had the significance of being the first to introduce the concept of the gremlin to cinema audiences.
Bugs is featured as relaxing at an air field, reading the book Victory Through Hare Power and is amused when the book mentions gremlins, accusing them of "diabolical sabotage". Bugs then hears (and feels) odd clanking sounds which upon investigation reveal a gremlin trying to detonate a blockbuster bomb with a mallet. Bugs pursues the gremlin aboard a bomber which is then put into uncontrolled flight by the gremlin. Bugs tries to keep the plane from crashing even as he is violently assaulted by the gremlin at every turn.
The Bugs Bunny cartoon was followed in 1944 by Russian Rhapsody, another short showing Russian gremlins sabotaging an aircraft piloted by Adolf Hitler.
A 1963 episode of The Twilight Zone, "Nightmare at 20,000 Feet", featured gremlins in this "aviation monster" sense, as William Shatner was a passenger watching helplessly as the creature attacked the plane. This episode was remade as a segment of 1983's Twilight Zone: The Movie, in which John Lithgow played the passenger watching in terror as the gremlin ripped apart one of the passenger jet's engines in mid-flight (the shared experience would be alluded to when Shatner guest-starred on Lithgow's television series 3rd Rock From the Sun in 1999) . The 1995 "Treehouse of Horror IV" episode of The Simpsons included a segment titled "Terror at 5½ Feet", an obvious parody of the Twilight Zone episode. In the segment, Bart Simpson played Shatner's role, watching as a gremlin worked at removing the bus's left rear wheel.
A movie called Gremlins, directed by Joe Dante, was released in 1984, followed by the sequel Gremlins 2: The New Batch in 1990. The gremlins in these movies had nothing obvious to do with aircraft in particular, although they were portrayed as adept at subverting or sabotaging mechanical systems, especially in the second movie which took place in a high-tech office tower. Also, a reference to the earlier mythologies was mentioned in the first film.