Activision has released a grindhouse-style trailer for the newest Call of Duty: Black Ops zombie map, Call of the Dead. Call of the Dead is apart of Escalation–the second downloadable map pack for Black Ops. The level is set in an undead-infested ship and is based on the zombie films of George A. Romero. The filmmaker even makes an appearance in the game. The game has four playable characters, all of whom are popular horror actors: Robert Englund (Nightmare on Elm Street), Sarah Michelle Gellar (Buffy the Vampire Slayer), Danny Trejo (Machete), and Michael Rooker (The Walking Dead). Escalation will be available for download on Xbox 360 May 3, 2011 and eventually will be released for PS3 and PC. Watch the trailer below.