We're off and killing on The Walking Dead Season 3.

This week's intense premiere took Rick and company behind the lines of a zombie-filled prison, jumping ahead a bit and making it very clear just who's in charge of the survivors.

How will the AMC follow-up with next week's "Sick?" An episode that features one life in the balance and brings a new threat to the group's surroundings? Watch the official network teaser now:

We've also posted a clip from the installment, as help is on the way for a wounded Hershel:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.