Trivia: This film spent several years in development hell largely because Fox wasn't sure that the film could be profitable, based in part on the character's negative reception in "X-Men Origins: Wolverine" and desire by the filmmakers for it to be rated R. It wasn't until computer animated test footage was leaked online to universal praise that the film was finally given the green light. Despite the hurdles the film had to overcome to get made, it ironically became not only the highest grossing film in the X-Men franchise (both domestically and worldwide), but the highest grossing R-rated film of all time worldwide.