The Passing is a downloadable expansion package for the survival-horror sequel, Left 4 Dead 2. It features a new, three-map campaign, set in zombie-infested suburban Georgia, that takes place on the timeline between the first and second campaigns of the main game. The expansion introduces a new uncommon enemy, the "Fallen Survivor," and two additional weapons, the M60 machine gun and the golf club. The add-on's storyline has the four playable characters from Left 4 Dead 2 meeting up with three survivors from the original Left 4 Dead game, who appear as computer-controlled characters in the expansion. The title refers to the passing of Bill, one of the four heroes in the original Left 4 Dead, who is revealed to have sacrificed himself to save the other three at an earlier time. ~ T.J. Deci, All Game Guide