Zombie Army 4: Dead War Adds Free Left 4 Dead 2 DLC Zombie Army 4: Dead War's new Season 3 "Return to Hell" campaign, players now have the opportunity to download free content based on Left 4 Dead 2; Coach, Ellis, Nick, and Rochelle from the latter game are now available to use! Back in June, Zombie Army 4 also added characters from the first Left 4 Dead in a similar free update, and now players can get the cast of the sequel. A new trailer has been released for the free content, showcasing the heroes from Valve's game doing what they do best: dispatching tons of zombie opponents!