The Crisis on Infinite Earths comes to DC-TV starting tonight, with Supergirl. We’ll have reviews—and we have an overview.

Lex Pendragon: On the CW, five shows are combining their audiences into one super crossover event, Crisis on Infinite Earths.

Based (at least loosely) on the DC comics event Crisis on Infinite Earths, the comics story that took the various Earths and different continuities and eventually combined the multiverse down to a single continuity. The Multiverse option was appealing to the showrunners, who embraced it to allow a crossover between Supergirl on CBS and The Flash on the CW. The shows loved to exploit this, giving us Flash hopping between universes regularly, using it for further crossovers, and eventually even referencing past shows such as the 90s Flash and Constantine (from NBC), who eventually joined Legends of Tomorrow.

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