Indien and Cowboy are about to leave for a wonderful luxury cruise, but they got confused... They forgot that today they have to get back to school! Good bye exotic islands, our heroes have to endure long and boring lessons. In order to make this new year a bit funnier and to welcome the new geography teacher, the school principal built up a little contest. The winners will go with M. Youri on a jouney to the moon. Indien and Cowboy will do anything they can to win the contest. But they are not alone. Their classmates, the farm animals, work hard to find the answer. The night is now far spent, and Cowboy and Indian are still looking for a solution. In the farm, most of the animals fall asleep. Suddenly, someone cries victory. Pig found the right answer. But Cowboy and Indian refuse to admit their defeat. They get an idea : they are going to rob an invention of their chemistry teacher to shrink objects and people. Through the potion, they get into the brain of Pig and steal the precious answer. The next day, in front of all teachers and pupils, poor Pig cannot remember anything. Cowboy and Indian proudly announce the right answer. However the crooks are discovered and fired from the school. The rocket is now flying to the moon. But where the hell are Cowboy and Indian ?