Now this is something cool from Activision and Treyarch.  Horror and action stars Robert Englund, Sarah Michelle Gellar, Michael Rooker and Danny Trejo have joined the cast of Call of Duty®: Black Ops Escalation’s zombie level, Call of the Dead.  The Call of the Dead zombie level and four all new multiplayer maps make up the second content pack, Escalation.  Dedicated to creating a Zombie experience like never before, the Call of the Dead storyline is inspired by none other than legendary horror writer and director, George A. Romero, who also stars as himself in the new level.

“Our latest zombie creation, Call of the Dead, is unreal!” says Mark Lamia, Studio Head of Treyarch. “We set out to create an exciting new zombie experience for fans of the genre that takes Zombies to an insane new level.”

“This is Treyarch’s tribute to the legendary George Romero, who truly defined the zombie genre and whose incredible work has been such an inspiration to our team.” says Dave Anthony, Call of Duty: Black Ops Director.  ”It was an absolute honor to work with such an amazing and talented cast whose passion and energy brought their characters instantly to life.  Fans are going to love this.”

In addition to George A. Romero, whose credits include Night of the Living Dead, Dawn of the Dead and Land of the Dead, he is joined by  Sarah Michelle Gellar, whose credits include the hit TV series, Buffy the Vampire Slayer and Cruel Intentions; Robert Englund, best known for originating the role of Freddy Krueger in the successful Nightmare on Elm Street franchise; Michael Rooker, most recently acclaimed for his work on AMC’s horror drama The Walking Dead; andDanny Trejo, who starred in 2010′s action-thriller Machete.

You can take a look at a few more screenshots of Call of the Dead here.