Marvel fans waited a long, long time for Steve Rogers (Chris Evans) and Peggy Carter (Hayley Atwell) to have that Avengers: Endgame dance. It was first teased starting when they met in Captain America: The First Avenger, and continued being teased in several movies since then -- whether you noticed that subtle easter egg song in The Winter Soldier or not. The build-up culminated in Endgame, as Captain America went back in time for his dance with Peggy to their World War II song, "It's Been a Long, Long Time."