The film adapts parts of two stories from the Astérix comic series: the plot about the false soothsayer is from the 19th album "Le Devin", while the plot of the druid losing his memory is from the 7th album "Le Combat des chefs".
There are two English dubs of this film. An American version and a British version. As if 2014, the British version has not been released on DVD. Only the American version is available in the UK.