James Gunn, the screenwriter and director of “Superman,” narrates a sequence featuring David Corenswet and Rachel Brosnahan.

This month’s epic superhero combo started with DC’s Superman, and soon the second punch will land with Marvel’s Fantastic Four: First Steps. Reviews for the hotly anticipated film are now starting to ...

His hit reboot is meant to kick off years of new projects from the rebranded DC Studios. But for a long time, Gunn couldn’t figure out the character.