Avengers: Infinity War and Avengers: Endgame are American superhero films based on the Marvel Comics superhero team the Avengers, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. They are the sequels to The Avengers (2012) and Avengers: Age of Ultron (2015), and respectively serve as the 19th and 22nd films of the Marvel Cinematic Universe (MCU). Both films were directed by Anthony and Joe Russo from screenplays by the writing team of Christopher Markus and Stephen McFeely. They feature an ensemble cast composed of many previous MCU actors, headlined by Robert Downey Jr., Chris Hemsworth, Mark Ruffalo, Chris Evans, Scarlett Johansson, Don Cheadle, Karen Gillan, Bradley Cooper, Gwyneth Paltrow, and Josh Brolin. In Infinity War, the Avengers, the Guardians of the Galaxy, and their allies unite to prevent Thanos from collecting the six all-powerful Infinity Stones and using them to kill half of all life in the universe. In Endgame, after failing to stop Thanos, the surviving heroes attempt to reverse his actions through time travel.