The upcoming Flash is more and more shaping out to become DC's Spider-Man: No Way Home next year, involving heroes and villains from other movies. One of them will reportedly be Michael Shannon's General Zod, who originally appeared in 2013's Man of Steel.
The source for the new hint is pretty reliable, as it comes directly from the updated Warner Bros. slate for 2022 on the official website. For The Flash, the cast lists not only Ezra Miller and Michael Keaton, who will reprise his role as
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