Gary and the Crew encounter a Titan in Inner Space, who informs them how to close the breach in the fabric of space. Gary gets a chance to spend time with his father for the first time as an adult, moments before his father's ship explodes.
Gary Goodspeed is a boisterous yet inept astronaut who, in the midst of working off the last few days of his five-year sentence aboard the prison spacecraft Galaxy One, encounters a mysterious planet-destroying alien. Soon, he befriends the alien, whom he names Mooncake, and discovers that Mooncake is wanted by the forces of a powerful telekinetic creature known as the Lord Commander. Together, with the ship's computer H.U.E, an army of similar but unfalteringly loyal robots, and a growing crew of new shipmates, Gary and Mooncake embark on a quest to save the universe, all while trying to uncover the mystery of what "Final Space" really is.