The Flash will see the return of Michael Shannon to the role of Superman villain General Zod, and the actor has opened up about what it was like getting back in character for the movie. Shannon was cast as General Zod by Zack Snyder for 2013's Man of Steel, which would become the only solo movie for Henry Cavill's Superman in the DCEU. Shannon's performance as Zod was greatly received, and excitement for the character's return from the dead — after Superman snapped his neck — in the multiversal The Flash is high.
https://screenrant.com/the-flash-movie-zod-return-michael-shannon/