A group of astronomers, led by Professor Barbenfouillis, convenes to plan an ambitious journey to the Moon. Utilizing a gigantic cannon, they launch a spacecraft resembling a bullet, manned by a team of six explorers. The adventurous astronomers embark on their interstellar voyage, landing on the lunar surface with a dramatic crash. Upon their arrival, they are amazed by the surreal, dreamlike landscape of the Moon, encountering wondrous sights like a lunar mushroom forest and starry skies replete with constellations that come to life.

The explorers' lunar expedition takes an unexpected turn when they discover the Selenites, the Moon’s insectoid inhabitants. Unprepared for such a confrontation, the astronomers are captured and brought to the Selenite king. They must find a way to escape from the alien civilization and return to Earth.