Michael Shannon is back as General Zod in The Flash – but the actor has revealed that he didn't feel comfortable returning until he got Zack Snyder's blessing.
Snyder directed Man of Steel, which saw Shannon's Zod as the main antagonist who went head to head with Henry Cavill's Superman. In The Flash, directed by Andy Muschietti, Zod returns via a multiversal mess that involves Barry Allen accidentally creating a world without superheroes after a time travel venture goes wrong.
