At a meeting of the astronomy club, Professor Barbenfouillis announces his next venture: to lead a manned expedition to the moon. Six astronomers volunteer to accompany him on his journey, which is made via a rocket shell catapulted to the moon by an enormous cannon. As soon as the explorers emerge onto the lunar surface, there is an explosion and they are sent in all directions. To recover, they lie down to sleep and dream a fantastic dream about the heavenly bodies. When they awake, they are half-frozen and decide to go beneath the moon’s surface to shelter. Their next discovery is a grotto filled with giant mushrooms - behind which emerge the lunar inhabitants, the Selenites. The explorers are taken to the king of the moon but manage to escape, by thrashing the fragile Selenites with their umbrellas. They return to earth to receive a hero’s return.