Following constant defeats by the rebel
Gauls in
Armorica, the
Roman Senate slowly begin to believe they may be
gods, due to their apparent invincibility.
Julius Caesar, openly disdainful of the suggestion, decides to test the village and meets with their chieftain,
Vitalstatistix. Caesar declares that the Gauls must undertake a challenge, inspired by
the Twelve Labours of
Hercules—in which their best warrior must complete a set of twelve new tasks that only gods could succeed in. Caesar states that is all the tasks are completed, he will hand over the
Roman Empire to them; if they fail even just one task, the Gauls must surrender to
Rome. Agreeing to the terms, the village assigns
Asterix and
Obelix to perform the tasks, with Caesar assigning Caius Tiddlus, a Roman man renowned for his honesty, to act as both their guide to the tasks and the challenges' referee. In their first set of challenges, Asterix defeats Asbestos the
Greek, champion of the
ancient Olympic Games, in a race, and Cilindric the
German in a
judo match, by outsmarting his opponent, while Obelix defeats Verses the
Persian, by managing to
throw a javelin further than him. In their next challenge, the pair find themselves crossing a lake to an island known as the "Isle of Pleasure", home to beautiful
Sirens, who they must resist. Although the Gauls nearly succumb to the women, Obelix comes to his senses when he learns that there are no
wild boars for him to hunt and eat, allowing the pair to accomplish the challenge. The pair continue to have further success, with Asterix defeating Iris the
Egyptian, by surviving turning his powerful
hypnotic power against him, while Obelix defeats Belgian cook Mannekenpix by consuming all of the meals he prepares—under the assumption they were
hors d'oeuvres. Following their success in enduring the "Cave of the Beast" in the next challenge, the pair find themselves told by Caius to acquire a permit document from "The Place that Sends you Mad", a multi-storey
bureaucratic building. After finding it impossible because of the clinically unhelpful people who direct them elsewhere, Asterix beats them at their own game by requesting an imaginary permit and turning their behaviour against them, resulting in the building's
Prefect to unwittingly hand over what the Gauls came for. The pair continue to complete further challenges: crossing a
ravine filled with crocodiles by beating them up rather than using an invisible tightrope; answering a riddle by the Old Man of the Mountain, conducted in the form of a washing detergent advertisement; and enduring a night on a plain haunted by ghostly legionnaires, who Asterix scares away through furious complaints. Asterix and Obelix eventually find themselves in
Rome, alongside their fellow villagers, for their final task. Brought to the
Circus Maximus, the Gauls fight against
gladiators, whom they beat, and defeat various animals sent against them by turning the arena into a modern-day
circus. Having succeeded in every task, Caesar agrees that they are gods, giving the Gauls control of the Roman Empire. Caesar retires to live a quiet and peaceful life with
Cleopatra, while Caius is rewarded for his service and retires to the Isle of Pleasure. As the village celebrates their success, Asterix answers Obelix's question of them really
conquering Rome by pointing out that everything that happened to them
was a mere cartoon, in which
anything is possible. Obelix takes advantage of this and
teleports himself and his wild boar meat to the Isle of Pleasure by the Siren High Priestress to enjoy himself. == Cast ==