'Deadpool' director Tim Miller is developing a secret 'X-Men' film

Deadpool director Tim Miller is back to the superhero genre with a secret film set in the X-Men universe.

The film, called 143, will be scripted by comic book writer Brian Michael Bendis, who created Jessica Jones.

The new film is believed to be a spin-off about Kitty Pryde, a young mutant who can walk through walls.

She featured in an issue of the "Uncanny X-Men Volume 143". In that edition, Kitty finds herself battling the N'Garai demon all by herself in the X-Mansion, reported Entertainment Weekly.

Ellen Page played Pryde, who has previously appeared in both X-Men: The Last Stand and Days of Future Past.

Miller is currently in pre-production his reboot of Terminator.

The director did not return for the sequel of Deadpool due to creative differences with star/producer Ryan Reynolds. Deadpool was his directorial debut.

"I felt like there was more stories to tell there, but I'm happy that somebody else is telling them. And I've got to tell you, there was a sense of relief in that I get to do something new versus Deadpool 2.

"I think it would've been a great movie, but it was also going to be a continuation of what we had done. This really gave me a chance to do something new," he told the Hollywood Reporter.

He is also linked to adapt the 1984 cyberpunk novel Neuromancer for the big screen. Written by William Gibson, the novel centres on Henry Dorsett Case, a disgraced computer hacker living in Japan who was punished for stealing from his employer by being rendered unable to access The Matrix, a worldwide virtual reality network.

Executive producing the live-action adaptation of Sonic the Hedgehog is also on the cards for Miller. Sonic game released in 1991 and since then the character has become one of the world's biggest gaming icons.