Space travel requires both mental and physical stamina, and when veteran astro-geologist Javier Fonseca withdraws unexpectedly from a vital rock-collecting mission, only one person passes the tests to replace him - his Irish research assistant, Dr. Glen Hosey. Glen has never been to space before and, unprepared for such a long mission, his unorthodox methods of passing the time aren't really compatible with the peaceful journey the other two astronauts