Operation: EndGame was the name of the plotting evil genius Dr. Ivo Robotnik's final plan to wipe out Knothole and eliminate the Knothole Freedom Fighters, specifically Sonic the Hedgehog, once and for all. The had numerous phases and was nearly carried out to completion, but due to Snively and Crocbot betraying the madman, the plan fell apart when the Ultimate Annihilator targeted only Doctor Robotnik, erasing him from existence.