Avengers: Age of Ultron is based on American comic books published by Marvel Comics.
Avengers: Age of Ultron . It is the sequel to 2012 's The Avengers and the eleventh film in the Marvel Cinematic Universe ( MCU ) . The Marvel Cinematic Universe ( MCU ) is an American media franchise and shared universe that is centered on a series of superhero films , independently produced by Marvel Studios and based on characters that appear in publications by Marvel Comics . The franchise has expanded to include comic books , short films , television series and digital series .