|Gender||Genderless (Male A.I.)|
|Occupation||Adventure Worlds Guide|
It is later revealed that Vortech banished X-PO to Vorton World but was unaware he had done so. It is unclear what happened when X-PO arrived in Vorton but we know that he broke into several pieces and then linked his A.I up to the Vorton computer. X-PO's A.I opens rifts leading to the missing gateway pieces hoping to repair the gateway.
Upon completing the level Once Upon A Time Machine in the West, and all the keystones for the Gateway have been collected, Gandalf notices several parts of the Gateway moving and hits them with his staff, causing Batman to scold him for breaking the Gateway, until Wlydstyle realises the Gateway is still working perfectly, making Batman wonder what the extra pieces are for. The Player must take off some pieces from the LEGO Gateway (physical) and build a model of X-PO. He then enlists the player to gather all of the Foundation Elements before Lord Vortech.
- He is voiced by Joel McHale.
- His name is short for Experimental Portal Operator.
- Given his role in the game, X-PO's name could be a play on the word 'Exposition' meaning to reveal information on subjects encountered in narratives.
- If the subtitles are on during the opening cutscene with Vortech and X-PO on Foundation Prime, X-PO will be labeled as an "Unknown Cubic Component".
- Before X-PO is repaired his A.I is coupled with the LEGO Gateway and he is referred to as the "Gateway Keeper". He controls the Gateway to open rifts to the missing Keystones and helps the trio in their journey by sending them Keystone Activators to solve puzzles.