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.

The Flash (film), Warner Bros. Entertainment Wiki

Zack Snyder Gave Michael Shannon His Blessing for Zod's DCU Return

MAN OF STEEL – UPROXX

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

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

Like Somebody Playing With Action Figures: Michael Shannon Calls General Zod Role In The Flash Unsatisfying

The Flash: Michael Shannon Says He Only Returned as Zod Because of

The Flash (film) - Wikipedia

Michael Shannon Is Zod in 'The Flash' With Zack Snyder's Blessing