Fan Casting Ironman: Updated

When Ultron is resurrected, and Scott Lang and Janet Van Dyne are killed, Tony Stark is the last one left who had a hand in creating Ultron and its now his responsibility to shut him down. The movie goes on with Tony and War Machine trying to download a virus into Ultron's database while Ultron starts wreaking havoc across the city. The movie ends with Tony getting the virus into Ultron's system, but Ultron destroys it and kills War Machine and Tony escapes but without an arm.