Geronimo Stilton and his cousin Trap journey to the Moon in order to stop the evil Pirate Cats from thwarting the Apollo 11 mission. The time-traveling Pirate Cats are on the scene of the 1969 Apollo 11 mission and want to sabotage this historic moment with their most audacious and harebrained plan ever. To stop them, Geronimo and his cousin Trap will have to get to the moon first.