X-PO is a robot resembling a box with two arms and a single purple eye. He can fly around, his full name is the Xperimental Portal Operator. His job is to control the gateways between worlds and he previously worked for the conqueror Lord Vortech to locate Foundation Elements before Vortech betrayed and dissembled him. X-PO now works with Batman, Gandalf & Wyldstyle to locate Foundation Elements to stop Vortech, sending them to where they need to go and giving them Keystones to solve puzzles.