Pariah enlists Black Lightning to help stop the Anti-Monitor after the Flash of Earth-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.
Stars: Grant Gustin, Candice Patton, Danielle Panabaker
Director(s): David McWhirter
Writer(s): Greg Berlanti, Andrew Kreisberg, Geoff Johns