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

The Jenkintown native appears in a small role in the DC Comics film that's heating up as a summer blockbuster.

Superman is one of the most highly talked about films of recent times. As the movie is lauded by the audience, James Gunn revealed the actual reason behind Bradley Cooper's cameo.