Crisis on Infinite Earths

Crisis on Infinite Earths is the name of the sixth Arrowverse crossover between, , ​​​​​, , and. It began December 8 - December 10 and finished on January 14, 2020.

Synopsis
The "Crisis" event brings together the heroes from multiple Earths to battle against the Anti-Monitor, a godlike villain who threatens to destroy all reality.

Trivia

 * Crisis on infinite earth episodes title were originally designed with "hour One", "hour two", "hour three" etc... before all being replaced by "part One", "Part Two", "Part Three" etc...
 * In some foreign countries the word "hour" was kept.