Legacies Collide

It all began with a snap...the two earths of the Marvel universe and the DC universe were about to collide, Tony had gathered all the infinity stones in an attempt to reinforce there earth. The Flash and Superman knew that due to that it would cause there world to die in the insuring destruction so the flash did what he does best.

He began running around his earth with Superman following close by, Batman keeping tabs on there progress as they both grew increasingly faster, Superman of course standing behind the Flash as they shared the speed force beside one another for the final impact. The plan was for the flash to move to nigh instantaneous transportation as he fused with the speedforce, once he was at that speed he would give it all to Superman as he would be durable enough to last as long as they needed for the final impact.

The moment finally came and Tony as at the exact spot the Earths would collide, and at the last moment he snapped. Superman and The Flash however clashed with the stones which rippled throughout the two earths and fused them completely, there universes, there lives, all the established heros were gone and created a clean slate for new heros and villains to arise.