3. 'Captain America: The Winter Soldier' (2014)
"Winter Soldier" proved to be the perfect Marvel movie for its time, combining the optimism and idealism of its predecessor with a newfound sense of paranoia and political intrigue. The Hydra conspiracy makes for a compelling narrative throughline, and the dynamic between Chris Evans' Cap and Sebastian Stan's corrupted Bucky Barnes gives the movie all the emotional weight fans could ask for. This sequel also had and continues to have a profound impact on the larger MCU. Without this movie, "Agents of SHIELD" might never have gotten good.