<Ul> <Li> Damion Poitier makes a cameo appearance as Thanos (credited as Man #1) during the mid-credits of the 2012 film The Avengers as Loki's mysterious benefactor . </Li> <Li> Josh Brolin appears as Thanos in the 2014 film Guardians of the Galaxy . He 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, while Brolin provided the performance capture of the character . 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> Brolin reprises his role (uncredited) in the mid-credits scene of the 2015 film Avengers: Age of Ultron . Thanos is seen retrieving an Infinity Gauntlet without stones saying "Fine, I'll do it myself ." </Li> <Li> Brolin will reprise his role in the upcoming films Avengers: Infinity War and its untitled sequel . </Li> </Ul> <Li> Damion Poitier makes a cameo appearance as Thanos (credited as Man #1) during the mid-credits of the 2012 film The Avengers as Loki's mysterious benefactor . </Li> <Li> Josh Brolin appears as Thanos in the 2014 film Guardians of the Galaxy . He 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, while Brolin provided the performance capture of the character . 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> Brolin reprises his role (uncredited) in the mid-credits scene of the 2015 film Avengers: Age of Ultron . Thanos is seen retrieving an Infinity Gauntlet without stones saying "Fine, I'll do it myself ." </Li>

Who voices thanos in guardians of the galaxy