List of crossover episodes

"An immortal Egyptian, aliens, parallel Earth Nazis. I have no idea why I'm even surprised at this point."

- John Diggle

A list of crossover episodes which involve characters from multiple shows in the shared multiverse. They are arranged chronologically, grouped by season.

Flash vs. Arrow
The first annual crossover event in the shared multiverse aired during the 2014–2015 season. Team Flash and Team Arrow help one another in their respective cities on ​​ and ​​.

Heroes Join Forces
The second annual crossover event in the shared multiverse aired during the 2015–2016 season. This crossover event serves as a set-up for ​​​​. Team Flash and Team Arrow join forces in order to stop Vandal Savage.

Invasion!
The third annual crossover event in the shared multiverse aired during the 2016–2017 season. An alien race called the Dominators invade Earth and the Earth-1 heroes call for help from Supergirl.

Crisis on Earth-X
The fourth annual crossover event in the shared multiverse aired during the 2017–2018 season. This crossover event serves as a set-up for the web miniseries ​​. During the Allen wedding, Nazis from Earth-X stir up trouble.

Elseworlds
The fifth annual crossover event in the shared multiverse aired during the 2018–2019 season. This crossover event serves as a set-up for the ​​ TV series.

Crisis on Infinite Earths
The upcoming sixth annual crossover event in the shared multiverse will air during the 2019–2020 season.