Humanity faces a battle for survival as Earth comes under attack from aggressive extraterrestrial forces intent on annihilation. Amidst the ongoing conflict, a group of astronauts infiltrates the alien mothership and uncovers a gateway to the invaders’ home planet. Before meeting a tragic end, they succeed in warning Earth. With limited options, Earth dispatches a top-tier military unit composed of experts in science and combat through the portal, aiming to thwart the invasion from within.