Long ago, Bouncer was an All-Star Roboto Ball player.  But when the evil Arkeyan Empire destroyed his home town and discontinued the games, he was converted into a security-bot and stationed in the mines.  It was there that Bouncer encountered dozens of Mabu prisoners who remembered him fondly from his playing days. He quickly became a bit of a celebrity around the mines, and it wasn't long before this new adulation convinced him that he could be just as much of a hero in life as he was on the field.  Thus, he decided to join the Skylanders and take a stand against the evil, Arkeyan overlords.