Just one of the surprises at Marvel Studio's Phase Three announcement last year, Captain Marvel, due to hit our screens on November 2nd ...
This is in keeping with comments that Joss Whedon let slip about there being previously unannounced heroes showing up in the highly anticipated sequel, but I think it is safe to assume we all thought it would be Chadwick Boseman's Black Panther or Spider-Man in a stealth cameo where he kept his mask on. Captain Marvel was the furthest from my mind, but if Marvel Studios have already cast Captain Marvel they have done the impossible, and kept a super hero casting secret in a world ruled by the internet. But again, this is still only a rumour, so should be taken with a grain of salt until we hear something official.