The movie starts with a mysterious girl riding her horse into a tree. Then she's rescued by millionaire Max Topfer, who is startled to discover in her possession a video showing him being shot by a man he doesn’t know. Both the girl, who has total amnesia, and the tape appear to have come from the future. With the aid of bodyguard Helmut, Max Topfer tries to find out why a total stranger is apparently going to kill him on camera.

In the midst of World War II, a French widow falls for a U.S. captain whom she hides from the Nazis and helps escape to Spain.

One little ancient British village still holds out against the Roman invaders. Asterix and Obelix are invited to help. They must face fog, rain, warm beer and boiled boar with mint sauce, but they soon have Governor Encyclopaedius Britannicus's Romans declining and falling. Until a wild race for a barrel of magic potion lands them in the drink.