"He's a great actor. I mean, some might say he's better than David in certain ways, but he just didn't fit the role, and that's why he didn't get that," the director said of Hoult, who plays Lex Luthor in the new movie.

Gunn spoke about how this film informs 'Supergirl,' 'Lanterns,' 'Clayface,' and more. Without spoilers, of course.