Doctor Strange: 7 Tony Stark Cameos That Would Rule
5. He Appears In A Vision
Not to be confused with The Vision, there is the possibility that we'll see Stephen Strange seeing Tony Stark.
Given what we've seen of the movie so far, it's shaping up to be the Marvel Cinematic Universe's version of Inception (no bad thing, though pulling that off is another matter entirely).
That means there'll be some unusual elements and ways of playing around with reality, and that could lead to the appearance of a certain Tony Stark. The idea of Strange having visions of other characters is a fairly loose and easy way of tying him into the wider MCU, and wouldn't require too much of a time commitment from Robert Downey Jr.
With Infinity War on the horizon, it could be something that shows Stark in trouble, causing Strange to reach out to him (obviously he's already going to be aware of the Avengers and Stark anyway), or perhaps not even Stark himself, but something concerning Thanos that means the then goes and seeks out Stark to give him the information.