After defeats by various heroes, including the Flash (Barry Allen) and Supergirl sacrificing themselves to destroy an antimatter cannon[8] and to save Superman[2] respectively, the Anti-Monitor absorbed the entirety of the antimatter universe and traveled to the beginning of time, intending to stop the formation of the positive matter Multiverse and to create a Multiverse where antimatter prevailed. When the heroes followed him there, he began to drain the power from most of them.[citation needed]