Joss Whedon has been slowly revealing details about the next big Avengers universe flick, "The Avengers: Age of Ultron," hinting to fans that the titular villain of his film won't be the killer robot we know and loathe.
Even before he unveiled the official name and logo for the film at Comic-Con, and that it would deal with Ultron's origin story, Whedon hinted the movie would feature a "brother-sister act."