The Twelve Tasks of Asterix was an animated movie which was also adapted as a storybook, and released (in the UK, at least) alongside the other Asterix comic books.
However, the content of the story is quite fantastical (even by the standards of the series in general). Do the events of the story fit into the (admittedly loose) continuity established by the rest of the comic books? To put it another way, do the events of 'Twelve Tasks' take place in the same 'universe' as the rest of the books? Does anyone have any commentary from Goscinny or Uderzo on this?