“Escalation”, the second Call of Duty: Black Ops map pack, to play as the zombie-killing dream-team of Sarah Michelle Gellar, Robert Englund, Michael Rooker, and Danny Trejo against a new and unnerving zombie menace. Set in a mysterious, ice-covered, remote Siberian island and inspired by legendary writer and director George A. Romero, a group of four fearless explorers fight for their lives amidst an army of bloodthirsty Soviet zombies.