200px "Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."

Cisco Ramon[src]

This episode is part of a larger crossover series, Crisis on Infinite Earths.

"Crisis on Infinite Earth: Hour One"[4] is the ninth and midseason finale episode of the fifth season of Supergirl, and the ninety-sixth episode overall. It aired on December 8, 2019[1].

The episode is the first part of the five-part crossover, Crisis on Infinite Earths​.


Shooting for Crisis on Infinite Earths began on September 24, 2019.[5]


  1. "Arrowverse 'Crisis on Infinite Earths' Crossover Adds Black Lightning Stars, Bruce Wayne — Get Full Schedule" - TVLine
  2. Stephen Amell (@StephenAmell) - Twitter
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 - First Look at Crisis on Infinite Earths Part One as Supergirl Photos Are Released Online - Comic Book
  4. "Supergirl - Episode 5.08 - 5.09 - Titles Revealed" - SpoilerTV
  5. Marc Guggenheim (@mguggenheim) - Twitter
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