The Avengers writer-director Joss Whedon said Sunday at San Diego Comic-Con that superhero-scientist Hank Pym (aka Ant-Man/Giant Man) won't be in his sequel Avengers: Age of Ultron

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And since Pym won't be in the film, Whedon revealed that Ultron -- the villainous robot created by Pym in the comics -- will have a different origin story in the big screen version. (Fans are already speculating that Tony Stark will now be Ultron's creator instead.)While Pym won't be in the sequel, Whedon did confirm that Jeremy Renner's Hawkeye will be back. Hawkeye was widely seen as the weakest member in the original film's lineup and hence the most expendable come time for the sequel.So why no Hank Pym? Why alter Ultron's origin that way? And how will Hawkeye be utilized in the sequel? Watch Marvel Entertainment's video interview below and let Whedon explain for himself:

Avengers: Age of Ultron opens summer 2015.