Alien Earth tells that the Earth has been captured by insectoids from another planet. The invaders, called rakshas, ​​quickly broke the resistance of the people and turned them into slaves. Over many decades, earthlings have degraded and most have even forgotten that people once built cities and cars, considering it fiction. Only members of the resistance resist the power of the Raksha, but their strength is only enough for pin pricks. Everything changes the moment the aliens decide to have fun again by hunting humans in the deadly jungle. The fate falls on a young man named Finn, but he not only escapes and survives, but also discovers psionic abilities in himself.

A key element of gameplay is crafting. Shops and department stores have been destroyed, so the protagonist will have to get food and resources from literally everything that comes to hand. For example, taking a stick and a sharpened stone, Finn will make a primitive but working spear, which will be useful for getting food. And the presence of a hot mixture and an intact bottle allows you to create a Molotov cocktail. Some Alien Earth characters – for example, members of the resistance – can also buy alien weapons. The leveling system is implemented simply – the more often a hero uses a specific weapon, the more effectively he uses it. Allies also help the protagonist improve his psionic skills. This greatly facilitates the passage of later locations and tests.