During a party for the aristocrats of Robotropolis, Doctor Robotnik announced that he had recovered some valuable artifacts from Mobupinchu and attempted to auction them off so he could raise money to build more Swatbots. Sonic, Sonia and Manic, who were posing as waiters, disturbed the auction and stole the artifacts in the chaos. Robotnik eventually returned to the valley of Mobupinchu to oversee a digging operation to find the true city, sending Sleet and Dingo to recover the artifacts that the hedgehogs stole.