IGN - Michael Shannon, who played General Zod in Man of Steel, was initially hesitant to return as the villain in The Flash until Zack Snyder gave his blessing.

Michael Shannon, who played General Zod in Man of Steel, was initially hesitant to return as the villain in The Flash until Zack Snyder gave his blessing.

Michael Shannon wasn't satisfied with Zod role in The Flash

Michael Shannon preferred playing Zod in Man of Steel to The Flash

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IGN - Michael Shannon, who played General Zod in Man of Steel, was

The Flash Star Michael Shannon Says Returning to General Zod 'Wasn

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The Flash's Michael Shannon Got Zack Snyder's Blessing to Return

The Flash (film) - Wikipedia

The Flash': Michael Shannon Got Zack Snyder's Blessing to Return as Zod