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

James Gunn ’s Superman is full of surprises, but one of the most unexpected reveals comes in the form of Guardians of the Galaxy alum Bradley Cooper stepping into the role of Jor-El, Superman’s Kryptonian father,

In the wake of the soaring success of 'Superman', Gunn briefly spoke about recruiting a 'Guardians of the Galaxy' friend to play Kal-El's father.