Every SAW movie after the second one, and I think the second one was a bit unnecessary.
The 4th Indiana Jones, completely unnecessary.
Terminator 3 was also unnecessary - in fact, all terminator movies, books, games, TV shows, etc were unnecessary after T2. It was all wrapped up with the second film, but of course, the studios couldn't resist making money.
In terms of games:
Far Cry 2 has already been mentioned, Bioshock 2 will be another candidate when it comes out for "most unnecessary sequel ever", Most Mario game sequels are getting prety useless (why save the damn princess if she's going to be captured again! Seriously, Nintendo, can you make a main-stream mario game that doesn't involve saving Peach?).
The 4th Indiana Jones, completely unnecessary.
Terminator 3 was also unnecessary - in fact, all terminator movies, books, games, TV shows, etc were unnecessary after T2. It was all wrapped up with the second film, but of course, the studios couldn't resist making money.
In terms of games:
Far Cry 2 has already been mentioned, Bioshock 2 will be another candidate when it comes out for "most unnecessary sequel ever", Most Mario game sequels are getting prety useless (why save the damn princess if she's going to be captured again! Seriously, Nintendo, can you make a main-stream mario game that doesn't involve saving Peach?).