Kate Mara insists 'Fantastic Four' depicts ''relatable'' superheroes.

The 32-year-old actress - who plays Susan Storm/Invisible Woman in the Marvel Comics-inspired movie - has revealed the upcoming film will show viewers the personalities behind their characters' powers.

She explained: ''We're trying to make these superheroes feel as relatable as possible. You get to know who Sue is before she has all these powers.''

The movie - which is set to be released next month - has been directed by Josh Trank, who continued to liken the film to a prequel because it introduces viewers to the relationship between the characters, who eventually become superheroes.

Speaking at Comic-Con 2015 in San Diego, he explained: ''It's an origin [film] but it almost works as a prequel of the characters before they become the iconic version of those characters. It's a group of friends who become a family.''

Josh, 31, continued to say he believes the film - which also stars Jamie Bell, Michael B. Jordan and Miles Teller - will please fans of his directorial debut, 2012's 'Chronicle', because it once again depicts an alternative science fiction thriller.

He said: ''After we made Chronicle, I wanted to tackle the same subject again in a different way. I wanted to explore a side of these characters we haven't seen before.''