The Second Robotnik War is the conflict between the Eggman Empire and the allied forces of the Kingdom of Acorn, United Federation, and other nations in various regions of Mobius. It takes its name from Doctor Eggman, who replaced Dr. Ivo Robotnik as ruler of the empire following his predecessor's defeat at the end of the First Robotnik War. The war ended abruptly after Dr. Eggman fell into madness following a defeat at the hands of Sonic the Hedgehog. However, conflict began once again as the Iron Dominion simply usurped parts of the Eggman Empire into its territory and continued the war against the Freedom Fighters.