In today's episode of What If...?, we visited a reality where Ultron managed to make The Vision's body his own. After gaining the power of the Mind Stone, the villain unleashed his master plan and made short work of Earth's Mightiest Heroes. Later, when Thanos came calling, he sliced the Mad Titan in half and upgraded himself with all six of the Infinity Stones.
Black Widow and Hawkeye, however, remain on Earth trying to find a way to stop Ultron, who enacts a plan that sees him wipe out almost every sentient being in existence across the cosmos.
Achieving his mission leaves the android directionless...until he suddenly achieves a higher state of consciousness and is able to reach through realities after hearing The Watcher's narration. With that, Ultron has access to the entire Multiverse (portrayed as a series of prisms here) and ends up battling an armoured Uatu through a series of different realities, including one where Steve Rogers is being sworn in as President of the United States in the present day!
Black Widow finds a way to defeat the villain, but not when he's in a different universe. A desperate Watcher, meanwhile, teams up with Doctor Strange Supreme and starts to put a team together.
That's where we leave things, but it's clear now that the Guardians of the Multiverse are going to assemble next week in a bid to put an end to Ultron. The Watcher has broken his oath, of course, and it will be interesting to see whether any of this ends up factoring into live-action MCU plans post-What If...?