The cast of Marvel’s “Avengers: Age of Ultron” turned up at the 2015 MTV Movie Awards to present their friend and co-star Robert Downey Jr. with the coveted Generation Award. To celebrate the big moment, the actor dropped an exclusive clip from the upcoming movie.

It’s been known for more than a year that the sequel to Joss Whedon’s 2012 masterpiece will include a scene in which Iron Man fights Bruce Banner (Mark Ruffalo), aka the Incredible Hulk. However, it took until now to reveal why the two superpowered buddies are going toe to toe in the first place.

In the exclusive clip, we see the same footage of Downey’s character suiting up with the now famous Hulkbuster armor. It then cuts to a talking head of the character revealing that the reason his friend is rampaging through a crowded city street is that Scarlet Witch (Elizabeth Olsen) somehow messed with his head. It was previously revealed that the character would have certain powers that allow her to manipulate the team; it turns out the Hulk is one of the characters she manipulates.

Check out the exclusive clip from the movie below and see the two heroes go punch-for-punch ahead of the film’s May 1 premiere. 

Click HERE for information on how to watch the MTV Movie Awards online. For a full list of nominees click HERE.