The renowned Marvel brand has become synonymous with success in the film industry, but it hasn't always been that way. Before the MCU achieved box-office success and turned the big-screen experience into memorable spectacles, superhero movies hadn't always performed well in theaters. Even now, after a series of profitable runs and Avengers: Endgame standing out as one of the highest-grossing movies of all time, the Marvel logo does not guarantee success, just ask Sony.