James Gunn cast Bradley Cooper for an important 'Superman' cameo because he needed someone 'who could walk in the footsteps of Marlon Brando.'

Writer/director James Gunn has a long history with Cooper, who, of course, was Rocket in the "Guardians of the Galaxy" series. So, it didn't take much arm-twisting when Gunn made a call to the Oscar-nominated multi-hyphenate.

James Gunn’s box-office hit Superman is chock-full of cameos, and there’s one particular collaboration in the film that came about via the DC Studios co-CEO’s past connection to the MCU. In the opening moments of the David Corenswet superhero vehicle,