- And there came a day, unlike any other, when Earth's mightiest heroes found themselves powerless against a threat too formidable for them to comprehend. On that day, Thanos declared himself supreme ruler of the universe.
- See the Marvel Database for Character Appearances and Plot Synopsis related to Marvel comics
- No special notes.
- Ultron first appeared in the comics in Avengers #54 as The Crimson Cowl
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