The DCEU and the Arrowverse grew in opposite directions to become the two longest-running DC live-action franchises, but things could have been very different if Stephen Amell's Green Arrow and Grant Gustin's Flash were part of the DC films. Two very distinct interpretations of the DC universe, the Arrowverse and the DCEU, started at about the same time, the former in 2011 with Arrow and the latter in 2013 with Man of Steel. A decade later, both the Arrowverse and the DCEU collect hits and misses and often lead to a discussion about which one is the best portrayal of the DC universe.
After the end of Arrow and the cancellations of Black Lighting and Supergirl, the Arrowverse now only consists of The Flash, Legends of Tomorrow, Batwoman, and Superman & Lois. The DCEU, meanwhile, is trying to find new a direction after Justice League's box office failure, actor departures, and behind-the-scenes controversies. Following the release schedule change that pushed The Flash and Aquaman and the Lost Kingdom to 2023, the next two DCEU movies for 2022 will be Black Adam and Shazam: Fury of the Gods.
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Arrow was heading for season 3, and TheFlash was about to premiere when the Justice League cast was first announced for Batman v Superman: Dawn of Justice. If Warner Bros. had instead opted for Arrow and its spin-off The Flash to be part of the planned cinematic universe, then there would have had to be a lot more collaboration between The CW and the studio, and most of Zack Snyder’s plans for the Justice League storyline would have had to be changed to incorporate at least the events of The Flash season 1 as well as to find a spot for Oliver Queen in the
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