QoTD 152: How would you implement the multiverse element into a pre-existing story?
For an introduction:
1. Just say it always existed but wasn't shown before or
2. Some unexplained event from the past was because of it or
3. Let a character accidentally (or intentionally) stumble into another universe where things are a bit or very different. From there they have to survive/explore this new place, find a way back home, maybe beat a bad guy, hangout with another version of themselves and fix whatever problem there is.
The multiverse thing has a lot of potential because anything could happen though I would definitely place some restrictions on that for convenience and consistency.
There are different scales it could reach as well from just one scene to the whole series being about it. You can't really go through every possible thing so it's better to only show bits you find interesting and imply there are more if you're going all out.
Even if the exact way it gets introduced is a bit dumb or too
mysterious, as long as the story and visuals (if any) are solid, it'll be ok.
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