Guillermo del Toro has revealed making the Justice League Dark film would be a childhood dream come true.
The Mexican filmmaker is overseeing the development of the film featuring DC Comics anti-heroes such as monsters Swamp Thing and Etrigan the Demon for Warner Bros, which he is also tipped to direct.
"I'm literally playing with two of my oldest and most favourite characters in my life - Swamp Thing and Etrigan. These were the guys I was drawing with crayons when I was a kid," he told Collider.
He added: "I cannot tell you how happy I am, but I am finishing my bible, and then I deliver that bible, which is about 45 pages, to Warners, and we have a screenwriter that we like and that we talk to, but he is writing his own movie right now and is thinking about it. But I am going to try to wait for him."
Guillermo - whose next film is sci-fi adventure Pacific Rim, starring Idris Elba and Charlie Hunnam - has already revealed that magician John Constantine, the leader of Justice League Dark, will feature in the movie.
"The route we're going is Constantine is our lead. Constantine is the guy who leads us in and out of the plot," he said.
"We have Swamp Thing, Etrigan, we have Zatanna, we have - I will spoil it - the Floronic Man. We have stuff that those who love the darker side of the DC Universe are going to appreciate, and we're trying to be true to the origins of the characters."