Sox is a Robot Cat that was made to assist Buzz, Sox would later help Buzz figure out the Crystal Formula that would take him 60 years to create inorder to make it stable for the warp drive in Buzz's Ship, in Buzz's last attempt to use the Crystal Formula, he ends up taking Sox with him since the current Commander Cal Burnside wants to dismantle Sox, Buzz takes Soxs with him inorder to put togeather the new mixture formula and as soon as they escape they go into warp drive one last time skipping 22 years and returns to T'Kani Prime where he finds himself in the middle of a invation of a new threat who calls himself Zurg and the Colony is at war with Zurg & his Evil Robots and Buzz & Sox ending up with a few Rebals being lead by Izzy the Grand Daughter of Buzz's friend Alisha Hawthorne who wants to take down the Zurg Mother Ship that had attacked the Colony and you'll have to watch the Movie to see the whole story.

Lightyears Sox the Robot Cat belongs to Disney/Pixar.