James Mangold is working on the script for a 'Logan' spin-off.

The 53-year-old filmmaker - who helmed the final Wolverine instalment starring Hugh Jackman - is keen to do another movie based on the story of Laura Kinney, played by Dafne Keen, who Wolverine helped to escape from the dark forces in 'Logan'.

He shared: ''We're just working on a script.''

And James was inspired to push this story forward after the success of 'Wonder Woman', which he says has made studios less fearful of having a movie with a female protagonist.

Speaking to the Hollywood Reporter, he added: ''Patty Jenkins' success with 'Wonder Woman' only solidifies more for studios that there's less to fear with a female protagonist.

''The more that keeps getting hit home, that ends up giving me more space turning around and going, 'Well, here we are with a female protagonist. That's incredible. And what are we going to do with her?' And that's where we are with that [the X-23 script] right now, dreaming.''

It comes after Mangold shared how he believed the R rating given to 'Logan' was key to the movie's success.

He said: ''I knew that if Hugh and I could get an R, then we'll have the freedom to make an adult film. Because the second the marketing arm of a studio realises it cannot market to children, five or six creative things happen.

''The scenes can go deeper, and can be written for adults. Not just language, not just [violence], as you're saying, but the themes can be more interesting, the words you're using can be more complicated. The ideas can be more complicated ... Also, the film comes under no pressure to be a platform for the sale of toys. Because there's going to be no kids to see it.''