Lol for a genuine idea, I’d say something like this: Godzilla and the other Titans had struck peace after the great monster war of 2004 (yes final wars reference) and had there own territory’s. Godzilla is awoken out of an iceberg because of humans drilling into the earth. He destroys the team of drillers, then checks on the other Titans. However, he finds Angirus dead, angry because Angirus was his sidekick, Godzilla travels around the world only to find more Titans slaughtered around the globe, like Titanosarus, Manda and even King Gidorah. Godzilla notes the villans trail and movement patterns, allowing him to predict the next path. This happens to be in the middle of the Indian Ocean, where Godzilla discovers that Gigan was the attacker. After a few tense fights, Gigan makes it to his destination: a large cave where a radioactive gem can be discovered. Gigan uses the gem to awaken Bagan from another dimension. Godzilla is soon to die, however is saved by every other monster, even the bad ones like Ebirah or Kumonga side-by-side- helping the good monsters like Rodan and Mothra. Soon they defeat deadly Gigan and Bagan in one final battle. The gem is destroyed, and all the monsters have now much greater friendships as the movie ends.
