The CW's 2021 Arrowverse crossover, which was already significantly scaled down after the massive impact of "Crisis on Infinite Earths," will now be cancelled entirely. The crossover, which was to take place between Batwoman and Superman & Lois, will no longer take place as a result of challenges to the filming process that have happened during the COVID-19 pandemic. Crossing over would have been difficult given the heightened safety protocols of the pandemic -- you'd be bringing new people into the production, and likely for just a week. There's also the risk that if someone tested positive for COVID-19 while an actor was on another show's set, it could shut down production of two shows instead of one while the quarantine period elapsed.