Robo-Jack was a robotic replica of its creator Jack Spicer designed to be his partner. In "The Shard of Lightning" it helped Jack to get the Shard of Lightning. It then betrayed Jack in a Xiaolin showdown and got destroyed by Omi. The second Robo-Jack was acting like the original since its activation and made Jack get late to the Woozy Shooter. It then locked him out of his evil lair. It got destroyed when Omi and Katnappé broke into Jack Spicer's lair to steal back the Shen Gong Wu Jack stole them from the Xiaolin Temple.