User blog comment:Larry1996/I miss Pepper Potts/@comment-24261329-20131217215942

During the San Diego Comic-Con, Joss Whedon mentioned, "We're doing our own version of the origin story of Ultron....We were crafting our own version of it where [Ultron's] own origin comes more directly from the Avengers we already know about.".

Between all in The Avengers we already know, what Avenger has Ultron-creating capabilities?