As the Avengers and their allies have continued to protect the world from threats too large for any one hero to handle, a new danger has emerged from the cosmic shadows: Thanos. A despot of intergalactic infamy, his goal is to collect all six Infinity Stones, artifacts of unimaginable power, and use them to inflict his twisted will on all of reality. Everything the Avengers have fought for has led up to this moment - the fate of Earth and existence itself has never been more uncertain.
Christopher Markus (born October 16, 1969) and Stephen McFeely (born February 24, 1970) are American screenwriters and producers. McFeely and Markus were the second and the third most successful screenwriters of all time in terms of U.S. box office receipts with a shared total gross of over $3.1 billion. However, in overall, they are the highest grossing screenwriters altogether in terms of worldwide box office with the total gross of $9.3 billion. They gained worldwide recognition for their works that include The Chronicles of Narnia film franchise and the Marvel Cinematic Universe (MCU), having written the first three Captain America films (The First Avenger, The Winter Soldier and Civil War), in addition to Thor: The Dark World, Avengers: Infinity War, and Avengers: Endgame, which is currently the second highest-grossing film of all time unadjusted for inflation. They also created ABC's Agent Carter TV series, set in the MCU.