Stephen Strange will be battling one of his biggest enemies, Nightmare, in Doctor Strange 2, according to the first film’s writer C. Robert Cargill.

During a Q&A session following an Austin, Texas screening of the movie, Cargill and director Scott Derrickson revealed the direction they're planning to take the pilot in the follow-up movie if they're invited back. The most exciting revelation is that Nightmare, the ruler of the Dream Dimension, will be movie's villain.

"Marvel movies work in threes. They also work outside of their threes. Some of the better Marvel films have more than one villain in them," Cargill said. "Scott and I have not laid the groundwork for it but what I can say is that I have a feeling that whatever Nightmare is involved with, Baron Mordo, being somebody who considers himself the defender of natural law will have something to do with it."

If you recall, Mordo was Stephen Strange's ally during the first installment. However, he felt betrayed by The Ancient One and Strange, who were leveraging forbidden powers to make things happen. According to the comics, Mordo (played by Chiwetel Ejiofor) becomes a villain.

"For those of you who have ever read the comics, you know that Baron Mordo has a very particular arc, and that's something we discussed with Chiwetel while working on the first movie," Cargill continues, "And part of the reason Chiwetel wanted to play Mordo was because he has a definitive ending as a character and it's such a fascinating ending. And I do know that whether we're attached or not, that Marvel plans on working towards that ending and fully realizing Mordo as more than just a cardboard cutout villain, but actually taking him to kind of Loki levels of awesomeness. That's the goal with him."

Cargill did make it clear that the sequel movie hasn't officially been greenlit. However, the Doctor Strange character will next appear in Avengers: Infinity War (out April 27th) with Benedict Cumberbatch in the role.