The Marvel Cinematic Universe's first phase culminated with Ant-Man.
Marvel Cinematic Universe . The first film released in the MCU was Iron Man ( 2008 ) , which began the first phase of films culminating in the crossover film Marvel 's The Avengers ( 2012 ) . Phase Two began with Iron Man 3 ( 2013 ) , and concluded with Ant-Man ( 2015 ) .