Question: when does thanos first appear in the mcu
Answer: The character appears in various Marvel Cinematic Universe films , portrayed by Damion Poitier in The Avengers ( 2012 ) , and by Josh Brolin in Guardians of the Galaxy ( 2014 ) , Avengers : Age of Ultron ( 2015 ) , Avengers : Infinity War ( 2018 ) , and the fourth Avengers film ( 2019 ) through voice and motion capture .