Josh Brolin (No Country for Old Men, Men In Black 3), the actor voicing Thanos in the Marvel Cinematic Universe, isn't sure when we'll see the Mad Titan next.

Last time we saw the purple-skinned villain was during Avengers: Age of Ultron mid-credits scene, where he vented his frustration with his inept underlings. Where he'll show up next is up in the air -- even for the actor who plays him. "I don’t know which one I’m in," Brolin told MTV when asked at an Everest press event if he'll appear in Captain America: Civil War. "That’s a Kevin Feige question. I know the trajectory of what they’re doing, but I don’t know exactly which one I’m in."

What's the best part of playing the most powerful being in the Marvel universe? Brolin says the reactions from die-hard fans. "I love going into a comic book store and a guy connecting me with Thanos, and seeing the incredible regressive awe that happens," Brolin said. "Like you see them lose 30 years in can’t-breathe awe. That’s fun, and I have a lot of respect for those fans. I’m excited about doing it, I really am."

When asked if he had a favorite Avenger, Brolin responded, "I don’t have a favorite because it’s me against all of them. I think the entirety is what I’m most looking forward to. Each and every one. I’m bringing the wrath."

The epic follow-up to the biggest Super Hero movie of all time. When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth’s Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to the Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

Marvel's Avengers: Age of Ultron will be available on Digital HD September 8, 2015 and on Blu-Ray October 2, 2015.