"Crisis on Infinite Earths" is a five-part crossover miniseries that aired in late 2019 and early 2020, featuring characters from various shows in the Arrowverse, including Arrow, The Flash, and Supergirl. The storyline revolves around the multiverse facing destruction by an entity known as the Anti-Monitor, prompting heroes and villains from different Earths to unite in a battle for survival. The miniseries is based on the 1985 comic book event of the same name, created by Marv Wolfman and George Pérez. It explores themes of sacrifice, heroism, and the interconnectedness of different realities, culminating in significant changes to the Arrowverse landscape.