An alternate galactic world in which a civilization called "Selenites" lives on the moon and controls most of the solar system, acting as protectors of Earth and humans. In full expansion throughout the universe, the Selenites discover a planet in the confines of the Kuiper Belt, which will be the starting point of this adventure.

Earthlings is a classic adventure that mixes puzzle solving with the action of taking down a multitude of enemies sword in hand, but also picking up objects, talking to characters or exploring the environments, although it will also have stealth as one of its playable mechanics , and all this controlled only at the click of a mouse.