A scientific experiment goes awry and rips a hole in the fabric of reality. It is a gateway to a parallel universe, similar to our own in some ways, yet vastly different in others. The concept of alternate universes coexisting within a broader multiverse has been a staple of science fiction and fantasy since Michael Moorcock first adopted the trope in his 1963 novella The Sundered Worlds. A fictional multiverse opens up an extraordinary range of new possibilities for creative storytelling, unconstrained by a single world’s established history or even its laws of reality. It is that malleability that makes multiverses the perfect narrative framework for a crossover story.
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