Apollo 17 was the last U.S.-sponsored lunar voyage -- or was it? Hours of found footage, classified for decades, point to a subsequent moon mission -- Apollo 18 -- that ended very badly. Astronauts John Grey (Ryan Robbins), Nathan Walker (Lloyd Owen) and Benjamin Anderson (Warren Christie), on a mission to install radar scanners, discover a Soviet space capsule nearby. The men also discover a dead cosmonaut, and unfortunately for them, learn how he died.