While on a stopover in the town of Aginum (Agen) during their triumphant Tour of Gaul, Asterix and Obelix agree to stop in Uptotrix's inn to regain their strength with a hearty meal. Unfortunately for them, the odious Uptotrix, a traitor in the pay of the Romans, has seasoned his roasted wild boars with sleeping tablets sufficiently powerful to put a whole cohort to sleep!