I like the idea of our current Avengers cast trying to right a wrong and having it blow up in their face. Does that have to be Ultron? Not necessarily. Tony and Thor have a thread going where they're going to try to trick Asgard into beefing up security and we could tie that into a larger plot where basically they all try to change the future to keep bad shit from happening, if you like.

Also if we did need Wanda for a temp plot, I could play her.