A Cosmic Rendition

A cosmic event fuses two universes together, overlapping their histories entirely. The foes grow stronger as they cooperate, all in a bid to exert their will upon Earth and the entire universe. Heroes from both universes emerge from the shadows and ally to face the threats together, unaware of the large threat working beyond the horizon, biding his time. Will their cooperation survive the test of time, or will they crumble before the ultimate foe makes his move? MCUxDC Crossover.