As the old saying goes, history tends to repeat itself, and that's especially true in the world of video games. When Doom set the industry on fire in 1993, it created a desperate need for other developers to have their own hyper-violent shooters. This gave birth to the Doom Clone, a term that has carried over into contemporary times. Just eight years later, Bungie would change the shooter world once more with the landmark release of Halo: Combat Evolved in 2001.