Marvel director Scott Derrickson told IGN what he'd most like to explore in a Doctor Strange sequel.

When asked what elements from source comics he’d most want to feature in another movie, Derrickson said:

“I really like the character of Nightmare and the concept that the Nightmare Realm is a dimension. [...] That’s early – that’s like the first Strange tale. I think that’s in the introductory episode of Doctor Strange, and I always loved that."

Nightmare did, indeed, first appear alongside the debut of Doctor Strange in Strange Tales #110 (July, 1963). He is the despotic ruler of the Dream Dimension, where humans visit while sleeping, has green hair and a black, horned horse named Dreamstalker. Who wouldn’t want to see that in a movie?

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Derrickson also went on to say why the character wasn't used as a villain in Strange's first cinematic outing:

“We decided not to do that because that’s a bit of a complex idea to try to introduce everything we do introduce and introduce the idea of nightmares themselves as being a dimension. I hope somewhere down the line we do get to explore that because I think that’s super cool concept.”

No sequel for Doctor Strange has yet been confirmed, though we know the character will feature in the upcoming Avengers: Infinity War movie, due for release in 2018.Doctor Strange is now out in the UK, and will be coming to US theatres on November 4th.