Two rival outer space alien ships appear above the Gaulish village. The aliens want to know the secret of the great weapon the Gauls have, which is "known throughout the universe". The aliens are styled on the happy-faced Walt Disney and Marvel Comics superheroes of the American comic book style on one side, and futuristic robot and insect-like Japanese manga style on the other. The album is explained by Uderzo as a tribute to Walt Disney, who inspired him to be an artist. Reception of the album was mixed, with many fans criticizing the sci-fi setting, and thinly veiled references to the Bush administration. Despite this criticism, the album was not disliked by everyone, and reportedly sold well.