"Lightyear" follows the legendary Space Ranger after he's marooned on a hostile planet 4.2 million light-years from Earth alongside his commander and their crew. As Buzz tries to find a way back home through space and time, he's joined by a group of ambitious recruits and his robot companion cat, Sox. Complicating matters and threatening the mission is the arrival of Zurg, an imposing presence with a mysterious agenda.