When Thanos inevitably wields the Infinity Gauntlet in the third Avengers movie, he is going to be insanely powerful - so much so that the combined might of the Avengers probably won't even register on his radar. However, assuming they take this iconic moment from the Infinity Gauntlet comic book arc, one man won't be phased by him - Captain America. After Thanos dispatched of the rest of the heroes who opposed Thanos, Captain America approached him defiantly. He boldly stated that as long as he stood against him, Thanos couldn't claim victory. Of course, Thanos went on to kill him, but it defined Captain America and the bravery of the heroes in one panel - and that's what this scene will do for the movie. Whether or not it will be Chris Evans' Steve Rogers or Sebastian Stan's Bucky Barnes in the role of Captain America by the time this movie comes around is open to debate, but it has to be included and it will be the iconic moment of the entire Marvel Cinematic Universe to date at that point. So there you have it - twenty moments that will define upcoming Marvel movies. Did you like this article? Do you agree with the entries on this list? Which other moments will define upcoming Marvel movies? Let us know your thoughts in the comments section below. And please feel free to follow me on Twitter!