WARNING: The following contains spoilers for the conclusion of “Crisis on Infinite Earths,” the latest Arrowverse crossover, which aired Tuesday on The CW.The CW’s five-part crossover event, “Crisis on Infinite Earths,” featured a veritable plethora of cameos and references to the larger DC Universe, including nods to comic books, other television shows, movies and even cartoons.
https://www.cbr.com/crisis-on-infinite-earths-what-is-gleek/