Wonder how Avengers: Infinity War came to be? Step inside the pitch meting that started it all! Find out how an exhausted screenwriter managed to shove Iron Man, Spider-Man, Captain America, Black Panther, Black Widow, Thanos, Tyrion Lannister, Star Lord, Groot, Gamora, Drax, Mantis, Shuri, Hulk, Thor and MANY MANY MANY more heroes into a single Marvel movie. Whew. Kind of nuts.