Two more actors have signed on for Frank Darabont's zombie TV series The Walking Dead. They are: Laurie Holden (who starred in Darabont's B-movie horror The Mist) as marksman Andrea, and newcomer Steven Yuen as a scavenger called Glenn. They join Andrew Lincoln (Teachers), Jeffrey DeMunn (The Mist), Jon Bernthal (The Pacific) and Sarah Wayne Callies (Prison Break) on this six-part AMC drama, scheduled to broadcast this October.