After being blasted into outer space by a secret cadre of The Avengers, the Hulk ultimately managed to find peace on an alien planet, but lost his beloved wife when the ship he was sent there in exploded. Believing that his former allies were to blame, the Hulk assembled an army and took aim at New York. During his battle with Earth's Mightiest Heroes, The Hulk crushed Doctor Strange's hands and buried Iron Man's Hulkbuster armour beneath the destroyed Stark Tower. So, while the Jade Giant didn't kill any of his fellow Avengers after returning to Earth desperate for revenge, he certainly came pretty close. The whole story was pretty brutal, but a big screen adaptation should go one step further. Having The Hulk return as a full on villain - more powerful than ever thanks to his increased rage - and actually killing some of The Avengers would make for tough viewing, but also ups the stakes of a story like World War Hulk. Just imagine for a second the Green Goliath crushing Iron Man within his armour and swatting his former love Black Widow to one side so hard that she's unable to survive? Pretty dark, right? Of course, this movie would also need to end with the death of The Hulk... preferably from a well placed lightning bolt from Thor.