Under the direction of Professor Calculus, the first manned rocket is hurtling through space. Onboard are Tintin, Snowy, Captain Haddock, and their companions. The flight is perilous enough, but even greater hazards are in store once the rocket is safely landed on the Moon. The explorers have narrow escapes as they make great scientific discoveries. But there is treachery afoot. Tintin and Snowy have never faced such dangers, and their fate is in the balance right up to the very end.