Battle for the Multiverse

"Well, this is it. This is the very ending of the very end. I was leading the charge for the Grand Alliance, the Future Alliance and all our fellow allies that're being unified against the Coalition of the Red Star and the Global Liberation Union. That could be one of the largest conflicts in history after surviving unending bouts of radiation. I hope this is gonna be it."

--Su Ji-Hoon, The Final Battle

The Battle for the Multiverse was the final battle for the fate of Earth and the entire multiverse, fought among the Grand Alliance, the Future Alliance, and their fellow allies united against the Coalition of the Red Star and the Global Liberation Union. The monumental scale of the battle makes it one of the largest conflicts in history.

It will be happened in during the final World War III that the Grand Alliance will defeat the enemies (this means that this battle will mark the official ending of the Great Interdimensional War).

Trivia

 * This battle is a mix between Avengers: Endgame 's Battle of Earth and Ready Player One 's Battle of Castle Anorak.