History of the World, Part II

History of the World, Part II was a fake sequel to 1981's History of the World, Part I.

Plot
The film would've been a continuation of the first one that would include segments such as Hitler on Ice, a Viking funeral and "Jews in Space".

Why It Was Cancelled

 * 1) The first film was a box-office disappointment.
 * 2) A large portion of the cast of the first film is now dead.
 * 3) There were no plans for a sequel to begin with.
 * 4) The "Part I" in the first film's title was a joke on a book of the same name by Sir Walter Raleigh, who was executed before a Part II could have been made.

Result

 * The idea of "Jews in Space" would eventually evolve into 1987's Spaceballs.