Michael Jackson desperately wanted to play the X-Men's mentor, Professor X. Tommy Lee Jones told Jim Carrey he hated him when they first met while working on Batman Forever. Thor was nearly turned into a tv special. Gwyneth Paltrow didn't realize she was in a Spider-Man film for two years. Leonardo DiCaprio tried to make Aquaman for a decade. The CEO of Marvel did everything in his power to stop Iron Man from appearing in Captain America: Civil War...