Asterix and the Falling Sky (French: Le ciel lui tombe sur la tête, "The Sky Falls On His Head") is the thirty-second volume of the Asterix comic book series, the ninth solely written and illustrated by Albert Uderzo and the only volume to introduce science fiction elements into the otherwise historical comedy series.

He informs the Gauls he is on a mission to confiscate their "secret weapon" (Getafix's potion) that is "known throughout the universe", in order to prevent it from being seized by evil aliens called Nagmas.

The Nagma is eventually defeated, and Toon abandons his quest for the magic potion as its only discernible effect on the aliens is to cause them to temporarily increase to an enormous size.

[8] Splinter describes it as 'polarising', and 'the strangest Asterix story' that most deviates from the classic feel of the series, whilst acknowledging the influences that led Uderzo into introducing such foreign elements into the comic.

[9] There were some favourable reviews, including from Wales Online who acknowledged that 'purists will probably be horrified', but states that the story contains all the classic elements of an Asterix adventure.