Small multiverses in fiction.

[Willie the Duck]

One of the great pastimes of the TLoZ fandom is trying to figure out the branching timelines. This notably involves the MM/WW split:

Ocarina of Time	--->	Majora's Mask	--->	Twilight Princess
	--->	The Wind Waker	--->	Phantom Hourglass

And that's again before going into worlds that just exist in their own spaces, like Termina, Lorule or the Twilight.

I, uh, recognize most of the individual words there (minus specific nouns, which are clearly person and place names).