Stowaway

The astronauts Commander Marina Barnett, biologist David Kim and the medical doctor Zoe Levenson travel to the space station MTS-42 in a two-year mission to Mars. Soon Barnett finds blood on the floor below the life support system and when she removes a panel, an unconscious and wounded black man falls on her and breaks her arm. Soon the crew learns that the man is the support engineer Michael Adams that was trapped in a device that removes CO2 from the air. They befriend Michael that helps them in minor tasks on board to kill the time. When the engineers from the Hyperion advise that the CO2 scrubber is not possible to be repaired, they explain that the station is only capable to support three lives, and Michael must be discarded to save the crew.