In the underground world of “beastie” fights, Sonnie is unbeatable — as long as she keeps her edge.

Three months after quitting the Phoenix Foundation, Mac puts aside his differences with his father and returns when he hears Jack is the target of a murderous dictator he double-crossed.

When a polygamist’s wife is murdered, he believes it’s related to a recent criminal case he was testifying in, but detectives believe it may be connected to his culture.

A delirious Eko wrestles with past demons; some of the castaways go to the Pearl station to find a computer they can use to locate Jack, Kate and Sawyer; Jack…

As a contentious city council vote on the future of the Arkham district approaches, politicians from both sides are in danger. Gordon and Bullock must race to protect the council…