Left 4 Dead 2: The Passing Trailer

Game add-on brings L4D1 survivors down south (0:45)
Valve has released a movie for The Passing, the first Left 4 Dead 2 add-on, now available for PC and Xbox 360. Left 4 Dead 2: The Passing brings the original Left 4 Dead (L4D1) Survivors down south for a meeting with the L4D2 cast, while delivering new single-player, multiplayer and co-operative gameplay.