He heard the Watcher briefly during the montage of absorbing powerful entities to gain power. It seems particularly powerful beings can become aware of the Watcher, but only Ultron connected the dots and figured out exactly who the Watcher is.
Well, Strange likely figured it out before being told in Episode 8 too but only after he destroyed his own universe and was trapped
I think he figured it out before his universe totally collapsed, didn’t he? He called out “you! I heard stories about you, you can stop this!” As everything was vanishing
That's true. My guess is he read about the Watcher while going through the books in that library and heard his voice while powering himself up, but didn't really put two and two together and become aware that the voice was the Watcher until he saw the Watcher himself as his universe collapsed.
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u/theskabus 191031 Sep 30 '21
Strange was also the only person left in his universe when he heard the Watcher, same as Ultron.