The choice to introduce Kang in the typically small-stakes world of Ant-Man was a deliberate choice, according to Marvel’s Kevin Feige in a new Quantumania featurette.
The first two Ant-Man movies were both breaks from the epic action of the rest of the Marvel Cinematic Universe.
Ant-Man and the Wasp was like a little ellipsis in the space between Avengers: Infinity War and Avengers: Endgame.
These movies were the intermezzo between major courses of the meal that is the MCU.
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Marvel Studios' Ant-Man and The Wasp: Quantumania | Enter the Quantum Realm