Stark then made it clear to Steve Rogers that if Ultron succeeded in uploading himself to the synthetic body, he might be stronger than any of them. Nick Fury then told them that he will take Bruce Banner to the Avengers Tower and said to Stark that he needed Maria Hill for "something dramatic". As the Avengers flew to Seoul, Stark was inside the NEXUS Internet Hub searching for the person who prevented Ultron from obtaining launch codes for nuclear missiles.
While hacking into the NEXUS to find Ultron's new enemy, Stark was shocked to find out it was J.A.R.V.I.S., who erased his memory and had scattered himself all across the Internet to block Ultron. It turned out that Ultron was afraid of J.A.R.V.I.S. and of what he could do, so J.A.R.V.I.S. went underground and prevent from Ultron from getting the codes. Restoring J.A.R.V.I.S.'s memory, Stark then sent his own programming back towards Avengers Tower.
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The Story of Tony Stark/Iron Man (Marvel Cinematic Universe)
ActionThis story tells the entire life of Tony Stark in the Marvel Cinematic Universe and how he became Iron Man and joined the Avengers and became their leader alongside Captain America. My 2nd favourite MCU superhero and Avenger.