4. Josh Brolin Will Voice Thanos
This is a piece of unexpected yet awesome news, as word broke this past weekend that Josh Brolin has been tapped to lend his voice to Marvel's big over-arching villain, Thanos. Many speculated that Vin Diesel had secretly been cast in the role, but according to several sources, Brolin will voice the Mad Titan in several upcoming films, including Guardians of the Galaxy, Avengers: Age Of Ultron, and probably Avengers 3. No word yet on whether or not he'll do some motion capture for the big purple alien or not, though he certainly has the physique and facial structure to pull it off (with some heavy CGI, of course).