The Last of Us trailer introduces Bill

Joel and Ellie manage to escape the infected by taking refugee in a house with some guy in a gas mask. The masked man turns out to be a new character named Bill, who knows Joel somehow and, as you can see in the cinematic, owes him a favor.

Bill is voiced by Hollywood actor, W. Earl Brown, who has appeared in numerous movies including There's Something About Mary, Scream, and Vanilla Sky. He also played Dan Dority in the acclaimed HBO series, Deadwood.