In a distant future where Earth has finally achieved lasting peace, humanity embarks on interstellar journeys not to conquer, but to explore. The third expedition arrives in the Vega system, only to uncover two mysterious worlds teeming with atmosphere and water. To their shock, the crew faces immediate danger as an unknown force attempts to obliterate their ship before they can make contact. After sustaining damage and losing three crew members in the turmoil, the surviving team crash-lands and seeks refuge from this evidently hostile civilization. As they lay their fallen comrades to rest, they are unexpectedly visited by four local inhabitants. But as night falls on the alien planet, one of the deceased returns, knocking at their door, and the crew realizes that something profoundly strange is unfolding around them.