After Thanos was first revealed during the end credit sequence of Marvel's The Avengers in 2012, many fans were wondering when they might get their next glimpse of the Mad Titan. After a report in May revealed that Josh Brolin is playing this powerful villain in Guardians of the Galaxy, Marvel Studios confirmed the casting at Comic-Con, after the actor took to the stage in Hall H while brandishing the Infinity Gauntlet.With Guardians of the Galaxy's theatrical debut just hours away, we have our first look at Thanos in this Marvel Phase Two adventure, courtesy of Instagram user SkiesTheLimitx92.