In the world of the PPC, each canon constitutes its own universe and HQ allows for travel between these universes. Some of these universes bear little resemblance to canon; others are alternative universe scenarios. The Multiverse includes all fictional, historical, and actual universes. Multiverse can also be used as an adjective, describing something or someone that crosses over between universes.

There are two known multiverses, called the prime and mirror multiverses (after the prime and mirror universes in Star Trek).

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