Disney and Marvel executives have been drilling home the point that when Avengers: Infinity War premieres late next year, it?s going to be the culmination of the Marvel Cinematic Universe of the past ten years. Thanks to a quick tweet today courtesy of actor Jeremy Renner, we now know that Clint Barton, a.k.a. Hawkeye, will be making an appearance as the Avengers take on the Mad Titan himself ? Thanos. Infinity War marks the fifth time Renner will show up on the silver screen as Barton.