Originally Posted by DarthSkywalker
Well if Ultron comes from the future, he could be a product of something Stark and Pym do down the road.
Quick brainstorm idea I just had:
Ultron comes from a few decades into the future as a product of two old men, Tony Stark and Hank Pym. He grows sentience and travels back in time to when his creators were young men (2015) and takes over humanity while capturing both Stark and Pym to protect them and his future existence.
There's several flaws and won't happen but speculation is fun