It's been said before, but it really is an incredible time to be a fan of superhero movies. You don't have to go too far back to find a time when it was just Batman films carrying the torch, but now you have the whole Marvel Cinematic Universe, the DC Extended Universe in the works, as well as the and franchises over at Sony and Fox. Three of the ten highest grossing movies of all-time are those featuring comic-book heroes (both Avengers films and Iron Man 3), while The Dark Knight and The Dark Knight Rises both grossed over $1bn. Even something like Spider-Man 3, generally a poorly-received film, took almost $900m at the box-office. It's big business, and that means that studios are determined to cash-in while the going is good. They now have plans not just for next year and the year after that, but stretching all the way to 2020 and beyond (Marvel's reportedly go as far as 2028!). However, even the best laid plans can go to ruin. A couple of misfires, especially with studios taking more risks, and films could be changed, postponed, shelved completely (or have the rights sold back to Marvel). Here are eight planned movies that studios will likely decide aren't worth it.