The short answer is no, you don't need to watch anything before Superman.

The cast of James Gunn’s Superman can be seen in some excellent movies and TV shows outside of the DC Universe. As the leader ...

James Gunn says that Superman doesn't need to make as much at the box office as some people are saying in order for it to be ...

With James Mangold set to direct a Swamp Thing film, what past stories and adaptations could he use for his own film and ...