In the not-too-distant future, a space rescue mission embarks on a harrowing odyssey to Mars, where what began as a simple operation turns into a nightmare. One astronaut, Captain Edward Carruthers, is the sole survivor of a previous expedition that encountered a terrifying fate. Now, the rescue team must confront the harsh truth: something sinister has been unleashed at the Martian base.
As the team investigates the tragedy, they soon discover that Carruthers is not the only one who has returned from Mars. An alien life form has boarded their ship, and it is more ferocious than they ever imagined. This being is relentless, feeding on human fears and weaknesses, turning the astronauts into prey in a deadly game of cat and mouse. Tension escalates with each new encounter, and mistrust begins to erode the group's morale.
With limited resources and time running out, the crew members must band together to try to stop this threat before it is too late. As paranoia grips the ship, they realize that perhaps the true terror comes not only from the unknown but also from within themselves. A desperate struggle for survival ensues as an ancient terror from beyond threatens to exterminate humanity as we know it.