Josh Brolin plays the menacing antagonist in the all-star Marvel caper, and will cause havoc for the band of MCU heroes.
Speaking in a new interview, Joe and Anthony Russo identified him as the character they are most keen for audiences to see.
“Okay, I’m going to start with Thanos,” Joe said in a Sina Weibo chat, reported by ComicBook.com.
“I’m most excited for the audience to learn about him. I think he’s a very interesting and complex villain.
“That’s why I like him. That’s why I’m excited for the audience to learn about him. I think his motivations, albeit psychotic, are compelling.
“And I think that in a lot of ways this is his movie, so it’s going to be very interesting to see how people respond to Thanos in the film.”
Brolin has already spoken out to tease his appearance in the film, which will be followed by the as-yet-untitled Avengers 4 in 2019.
“They [Russo brothers] showed me a little six-minute teaser of a scene that I had done, I was so blown away by how next-level this digital process is and how real it feels,” he told Collider.
“I don’t know how I could be anything but happy.
“If everybody hates me at the end of it, I don’t know, will it be worth it if it’s a great movie? Maybe.”
Avengers: Infinity War is out on April 27 in the UK.