Astérix et la Serpe d'Or (lost animated comic book-based film; 1967)
In 1967, editing company Dargaud and animation studio Belvision adapted the first album of the popular Asterix series into the animated movie Asterix the Gaul. This was done by the companies' editor and CEO without the knowledge of Asterix creators René Goscinny and Albert Uderzo, who only found out about it after completion.
At the same time, Dargaud and Belvision were already working on an animated movie adaptation of Astérix et La Serpe d'Or ("Asterix and the Golden Sickle" in French), the second book in the series, that would have been 68 minutes long.
An adaptation of Asterix and the Big Fight was also intended.
However, Goscinny and Uderzo were displeased by how the first movie turned out - especially because of how cheap and simplistic the animation was. They asked for production on the sequels to be ceased, and for all animated work already done on the Golden Sickle and this first Big Fight adaptation to be destroyed.
To this day, all that has been released to the public are some celluloids that were showcased at a 2005 convention in Brussels; Belgium called Asterix: The Mirror World. Unfortunately, any other work that was completed may probably be permanently lost.
Asterix and the Big Fight would eventually get a screened animated feature adaptation in 1989.