Pic'ed to your left, is the official poster for Season 4 of AMC's "The Walking Dead"! That debuts on Sunday night, October 13th! Meanwhile below, you can check out a whopping 30 plus stills from Season 4! While also below is the extended version of the Season 4 Trailer! Lastly, newcomers to the series for the fourth season - will include actress Alanna Masterson. Reports Deadline. She is rumored to be playing the role of Tara Chalmers of the Chalmers family. First seen in the "Rise of the Governor" spinoff graphic novel. Masterson also reportedly could become a regular to the series in Season 5. Other newcomers to Season 4 include actors Vincent Martella and Christian Serratos. In episode #1 of Season 4, called "30 Days Without An Accident"...Rick and the group are as close to an ideal life as possible at the prison. Will they be able to hold on to humanity in the face of a new evil?