Marvel moved away from Kang and towards Doctor Doom around the time of Ant-Man 3's failure

Doom was locked in during "early 2023" ...
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Ant-Man 3 Had Very Different Ending Before Last-Minute MCU Movie Reshoot — Report

Ant-Man and the Wasp: Quantumania almost featured a far less happy ending than the one included in its theatrical cut. What was the original ending of Ant-Man and the Wasp: Quantumania? Ahead of the ...
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"Ant-Man 3" Premieres on Free TV: A Dead End for the Marvel Universe

With "Ant-Man and the Wasp: Quantumania", the third "Ant-Man" installment, premiering today, October 12th (8:15 PM, ProSieben) on German free TV, a Marvel film that has proven problematic in many ways ...
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Ant-Man 3's box office performance, explained

Ant-Man and The Wasp: Quantumania was meant to be the big start to MCU's Phase 5, but it might be fairer to call it a big stumble. Its reviews were decidedly mixed and that's putting it politely. For ...