When the Hulk gets out of control and needs to be taken down, there's only one man that can handle him -- and that man uses a machine to do it. Tony Stark's Hulkbuster armor is designed to do exactly what it's named after, and fans waited quite a while after its comic book debut to see it deployed on the big screen. Hulk battled Hulkbuster for one extreme action scene in 2015's "Avengers: Age of Ultron, and now the two are squaring off again.
"Iron Man Gamma Protocol" is an animated fan film that unofficially pits the Hulkbuster against the Hulk once again as Iron Man works with General Ross to bring the rampaging giant to a halt. The fan film also uses the likenesses and designs from the Marvel Studios films, giving a nearly in-universe feel to the battle. You can watch the four-minute melee below, as the two titans clash -- and destroy pretty much everything in their general vicinity.