So whilst looking for theories on the MCU on the internet, I found an interesting theory about [The Avengers: Age Of Ultron](movie:293035).
The theory is that Doctor Stephen Strange could make an appearance in Avengers 2.
Evidence to support this:
Well in the first trailer we get we see an old building set in the mountains, followed by the scene of Captain America kicking open an old door, which is followed by Captain America walking down stairs which is what we assume is the building in question. Now we know that this is probably a HYDRA base but what if it's something else in the other movies?
Now it’s safe to assume that this strange building is not in the United States and, since we've seen set photos of Captain America in Asia, these mountains are probably the Himalayas.
The Himalayas are, of course, the place where [Doctor Strange](movie:559685) sought out Earth’s Sorcerer Supreme – the Ancient One – and we’d bet that he will be found in – or at least linked to – this very building when the Doctor Strange movie comes out.
If you haven't seen the first trailer for Avengers 2: Age of Ultron then watch it here:
So what do you guys think? A small Strange cameo or what?