In November of 2008, we were introduced to the survivors. Three years later, they are still fighting for survival in a world that has been consumed by the zombie apocalypse. In September of 2009, they crashed courses with the survivors of Left4Dead 2. Now, the gang is going to get back together but someone will have to pay the ultimate sacrifice: their own life for the rest of the team.

In the latest downloadable content from Valve Studios either Francis, Louis, Zoey or Bill will need to let themselves have their brains become dinner for the coming infected. In four days, the DLC will be available for both Left4Dead the original and Left4Dead 2 on OS X, PC & Xbox 360. While the content will remain free for the desktop-based players, it will most likely cost 360 gamers an expected $5 or 400 Microsoft Points. Check out the trailer by clicking here.