Crisis on Infinite Earths

"Crisis on Infinite Earths" is the sixth annual Arrowverse crossover event and features episodes of the television series Supergirl, Batwoman, The Flash, Arrow, and Legends of Tomorrow on The CW. In "Crisis", the Monitor gathers Green Arrow, the Flash, Supergirl, Batwoman, Sara Lance, Ray Palmer, and several others from throughout the multiverse to stop the Anti-Monitor from destroying reality. The crossover's events result in the Arrowverse being rebooted, affecting all of the series.