Crisis on Infinite Earths: Part Three

The episode is the third part of the five-part crossover,.

Synopsis
Pariah enlists Black Lightning to help stop the Anti-Monitor after Flash-90 shares what he learned from his battle in "Elseworlds". With the help of Black Lightning, Barry, Cisco and Killer Frost come up with a plan that could save them all. Meanwhile, Iris has a heart-to-heart with Ryan Choi, while Oliver and Diggle return to an old familiar stomping ground.