Thanos is a fictional antagonist appearing in American comic books published by Marvel Comics. Created by writer Mike Friedrich and writer-artist Jim Starlin, the character first appeared in Iron Man #55 (cover dated Feb. 1973).
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. The character has appeared in other Marvel-endorsed products, including animated television series, arcade, and video games. Thanos is one of the most formidable Marvel villains.