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