Ok, if Smash Bros. were to be like a movie, just like the Avengers, here's how it should turn out:
5 sagas from the classic era of Smash of the Master Hand being the imaginative creator, to the biggest Video Game crossover in the history of video games.
Smash 64: Imagination
Melee: Imagination and Structure (referring to the Adventure mode)
Brawl: Subspace Emissary
Smash 4: Master Core
Ultimate: A renuion with old characters and newcomers and defeat Sephiroth, who single-handedly defeated Galeem in front of everyone, including Cloud.
And here's a thought, what if Cloud was having those visions from the remake as soon as he's in Smash, but warns everyone that a bigger threat than Master Hand and Galeem is coming to destroy the universe. Also, this is the best thing I've seen, this should be an official intro.