The Gremlins

NOTE: This is not to be confused with the 1984 movie.

The Gremlins was a planned Disney film, based on a 1943 Roald Dahl book.

Plot
Mythical Gremlins are blamed for causing mechanical problems for pilots in the British Air Force during the Second World War.

Why It Was Cancelled

 * 1) Warner Brothers released the Bugs Bunny short Falling Hare the same year using the same premise.

Result

 * Two screenplays were written, and a promotional book was released before the project was put aside.