6. Secret Wars
Secret Wars would make for such a cool, unique movie. The Secret Wars storyline was initiated by the immensely powerful cosmic entity the Beyonder. It was an arc in which he summoned a group of both superheroes and supervillains and teleported them, against their will, to "Battleworld" a planet he created himself in a distant galaxy. So powerful is the Beyonder that all of the heroes and villains in question are completely helpless to prevent him from doing so. The heroes and villains include characters from the X-Men (including Fantastic Four characters), Spider-Man and Marvel Cinematic Universe franchises, including the likes of Captain America, the Hulk, Thor, Hawkeye, War Machine, the Human Torch, Mister Fantastic, the Thing, Spider-Man, Colossus, Cyclops, Nightcrawler, Professor X, Rogue, Storm, Wolverine, Doctor Octopus, Ultron and Doctor Doom. Can you imagine all of those characters (and many more) being forced to go at it against each other in live action?! He stocks Battleworld with alien weapons and technology and declares "I am from beyond! Slay your enemies and all that you desire shall be yours! Nothing you dream of is impossible for me to accomplish!" and has them fight to the death essentially for his own amusement. Pretty awesome, huh?! There were numerous interesting sub-plots, including love stories and Doctor Doom stealing the Beyonder's power - all of which would make for a very interesting live action spectacle (hell, the Beyonder is so powerful that this wouldn't even require the continuities to merge - he could just pluck the characters from different universes).