Avengers: Age of Ultron
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Tony Stark's peacekeeping AI goes rogue and decides humanity is the problem. The Avengers must stop Ultron before he wipes out the world, as new heroes emerge and old scars surface.
Gives Wanda and Pietro Maximoff their origin and plants the seeds that grow into the Scarlet Witch of WandaVision.
See WandaVisionWakanda is name-checked as a hidden nation with vibranium, setting up Black Panther.
See Black PantherSkipping these means missing the setup this entry pays off. See the Watch Order page for the full picture.
Thanos puts on the Infinity Gauntlet, promising to do it himself after a failed attack.
Age of Ultron: The Film That Planted Every Phase 3 Seed
From Wanda to the Infinity Gauntlet, the most crowded film in the saga quietly set everything up.