Ahh Rage, our love was short but passionate. Developed by id Software, the studio that brought you Doom, came Rage, an amalgamation of Fallout and Doom, with a dash of Mad Max. The game takes place after a massive asteroid wipes out the majority of humans on Earth. You emerge from an underground shelter, known as an Ark, into a world attempting to rebuild, filled with strange characters, monsters and a frenetic car culture. It was awesome.
A sequel to the game was planned and even started before id Software made the decision to halt all development of Rage 2 and put those resources to work on Doom 4. That was a few years ago and Doom is still being worked on. The good news is that the team is supposed to start again with Rage once Doom ships. id has reiterated on several occasions that the series is not dead. Yay!
Funnily enough, there was a Rage 2 easter egg in the original, as seen above. The egg hinted that Rage 2 would release the same year as Doom 5, little did they know Doom 4 wouldn't even be out by then!