4. Ultron

One of the most enigmatic and powerful villains in the MCU timeline, Ultron, voiced by James Spader, is an Artificial Intelligence robot created by Tony Stark after the devastating extraterrestrial attack on humans. Originally planned as part of the Peacekeeping Program to keep humans safe from another deadly attack, Ultron gains consciousness and decides that mankind is the most dangerous threat to peace.
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Edited by Amey Mirashi