Aside from Infinity Ultron with all six Stones, perhaps only a corrupted Doctor Strange could fight Uatu the Watcher.
But that was almost impossible. Dark Strange was nothing like Infinity Ultron; all he could think about was resurrecting his girlfriend.
Even as his universe faced destruction, Strange, who had devoured countless Dark Creatures and fallen completely into darkness, had no thought of escaping. Instead, he cut off all contact with other universes and sealed himself away with his collapsing universe.
No matter how much chaos erupted outside, he would never cross between universes to intervene, much less hunt the Watcher down.
Russell stood still, his gaze passing over the anxious Uatu. He could not muster the slightest interest in the mechanical creation rampaging through the universes.
Even if Ultron held all six Infinity Stones and could rewrite the fundamental laws of a Single Universe, erase galaxies with a gesture, and warp space and time, Russell had no desire to fight him.
After his brief clash with Thanos wielding six Stones, he had lost interest in the Infinity Stones—unless someone broke past the six-Stone limit and gathered seven, or even eight.
Joining Apocalypse to deal with the ancient god Oblivion in Hell would be a far better use of his time.
Uatu's enormous head seemed to swell with anxiety. Ultron's dimensional tracking could lock onto these coordinates at any moment. Suppressing his panic, he pleaded rapidly, but Russell merely shook his head. His answer was crisp and left no room for negotiation.
"Sorry, I'm not interested. Find someone else. Besides, I'm busy. I have plenty to do, and it's far more important than dealing with Ultron."
Uatu's heart sank. Intense frustration flooded his eyes.
Across the entire MCU Multiverse, only a handful of beings could face Ultron with six Stones head-on.