Morgan searches for Al, only to discover that he's not the only one looking for her, and that his search may have put a target on his own back.

When Charlie shows up at the Tower unexpectedly, Howard recruits a young Ranger in training to determine the reason for her visit; as they journey beyond the Tower together, Charlie's true motives are revealed.

The heroes fight the clock and PADRE's forces.

A survivor is at odds with the rest of the island and is forced to turn to another for help.