So... now what?

The Second Mass arrived in Charleston at the conclusion of last week's Falling Skies episode, leaving viewers to wonder what will actually go down in this southern city.

We'll find out more on Sunday's "The Price of Greatness," of course, which will include the first appearance by Terry O'Quinn (Lost, 666 Park Avenue) as Tom's former mentor. What role, exactly, will he play? How will the unit be greeted as a whole?

Click through photos from the installment now and prepare for the final two episodes of Falling Skies Season 2:

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