James Gunn says the treatment for his 'Superman' sequel is 'totally done,' and that shooting will begin 'much sooner rather than later.'

Edited together as part of a 60-minute making-of feature, the seven-minute video shows Gunn walking Corenswet through Superman’s big final confrontation with Nicholas Hoult’s Lex Luthor, and specifically the moment when the Man Of Steel reminds Luthor he’s just as human as the rest of us.

"For you to talk about how it's OK to be vulnerable, you have to be vulnerable," Gunn told the "Superman" star