Brolin has been linked to the role since late May via various trades, and the internet being the internet, fan sites had been reporting the casting as fact since then. The actor was actually only officially confirmed for the role by Marvel at Comic-Con when he took the stage with his fellow Avengers cast mates and wearing an Infinity Gauntlet replica.
The five-minute Marvel’s Phase 1 & 2 – A Look Back is an impressive retrospective of the vast cinematic story arc that began with 2008’s Iron Man. Each “Phase” concludes with an installment of The Avengers. Guardians of the Galaxy is the last film in this cycle before Avengers: Age of Ultron concludes Phase Two. I didn’t make mention of Brolin’s big screen debut as the Mad Titan in my review of GoTG yesterday since I considered it a bit of a spoiler, even though Thanos does appear and factor into the plot.
But since the cat is out of the bag, here’s what Brolin looks like as Thanos with the assistance of some CGI and performance capture. You can also see the footage from where the still originated from at the end of the Phase 1 & 2 – A Look Back video below.