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Captain America: The First Avenger

The film that planted the MCU's moral compass into 1940s wartime establishes Steve Rogers as the franchise's only true idealist — a character whose values predate any superpower and survive every institutional betrayal. The WWII backdrop gives the conflict genuine historical weight while introducing the Tesseract, Red Skull, and HYDRA as the connective tissue for the next decade of storytelling. Chris Evans finds depth in Rogers' pre-serum determination, making the transformation feel earned rather than arbitrary. It is the franchise's most classically structured origin film: a man who is already a hero before he becomes a superhero.