<Li> Thanos appears in the Avengers Assemble and Guardians of the Galaxy animated shows, voiced by Isaac C. Singleton Jr . </Li> <Ul> <Li> In The Avengers (2012) Thanos makes a cameo appearance in the middle of the end credits . Damion Poitier (credited as Man #1) portrays Thanos as Loki's mysterious benefactor . </Li> <Li> In Guardians of the Galaxy (2014) Thanos tries to use Ronan the Accuser to obtain an Infinity Stone . The film also introduces him as the adoptive father of Gamora and Nebula . Sean Gunn stood in for Thanos on set . Josh Brolin provided the performance capture for Thanos . Thanos was originally going to have a larger role in Guardians of the Galaxy, but Joss Whedon felt that the character needed to be threaded more gently . </Li> <Li> In Avengers: Age of Ultron (2015), Thanos makes a cameo appearance in the middle of the end credits . He dons an Infinity Gauntlet and vows to retrieve the Infinity Stones himself . Brolin reprises his uncredited role . </Li> <Li> In Avengers: Infinity War (2018), Thanos is once again portrayed by Brolin . In the film, he seeks the six Infinity Stones because he believes the Universe is overpopulated and wants to cull it by half so that those who remain may have a better quality of life . </Li> <Li> Brolin will reprise his role in the fourth Avengers movie (scheduled US release, May 3, 2019). </Li> </Ul> <Li> In The Avengers (2012) Thanos makes a cameo appearance in the middle of the end credits . Damion Poitier (credited as Man #1) portrays Thanos as Loki's mysterious benefactor . </Li> <Li> In Guardians of the Galaxy (2014) Thanos tries to use Ronan the Accuser to obtain an Infinity Stone . The film also introduces him as the adoptive father of Gamora and Nebula . Sean Gunn stood in for Thanos on set . Josh Brolin provided the performance capture for Thanos . Thanos was originally going to have a larger role in Guardians of the Galaxy, but Joss Whedon felt that the character needed to be threaded more gently . </Li>

What was the first movie thanos was in