GTA Alien Invasion is a free mod for Grand Theft Auto V, where instead of the player playing the role of a normal citizen, it gives players the experience of fighting against an alien invasion. The game will take place in the massive open world of Los Santos from Grand Theft Auto V but with the appearance of aliens and UFO spaceships.

Players will learn that the surrounding environment is quite familiar, but only the context changes. You will fight on the familiar streets of Los Santos, but now the city is filled with UFO fleets and hostile alien soldiers. Confronting aliens requires powerful firepower. The game offers a variety of traditional weapons, such as machine guns and grenade launchers, in addition to advanced alien energy weapons.

Not all residents flee in panic, but some can form resistance groups, providing missions to players and assisting in fighting against aliens. You can now interact with these seemingly lifeless characters normally, and that helps bring a new and exciting alien combat experience.