Tom Connolly

The BAU investigates a group of suspects with a pack mentality who are randomly selecting their victims in the nation's capital and murdering them for the thrill of it.

A patient is admitted after breaking out in a severe rash triggered by caustic chemical exposure at his blue-collar job. As the team treats him, they discover that he has led his wife to believe that he is still maintaining his once-lucrative real estate career. Meanwhile, Cuddy is honored with an award and needs House to be at the charity event for support, but his attendance is threatened when his patient’s battle to survive forces him to question his practice and his own happiness. Also, Chase and Masters teach each other a lesson in forging meaningful personal and professional relationships.

Time shifts on the Island throw Sawyer, Juliet, Faraday, Locke and everyone else for a loop; Ben enlists Jack to get the Oceanic Six back together; Hurley enlists his parents' help when Sayid is tranquilized.

A time shift forces Farraday, Charlotte, Sawyer, Locke and Juliet to encounter The Others in the 1950s; as he attempts to carry out Farraday's directions, Desmond is forced to face Charles Widmore.

Apollo, a Hearst student who suffered hardships as a child soldier in Africa, appears on Piz's radio show, prompting a man to come forth claiming to be his father. But Veronica's investigation unearths some surprises. Meanwhile, Neptune is faced with a crime spree that could spell trouble for Keith's campaign, and Logan finds himself in a difficult situation when Parker wants to spend to summer with him. Veronica awaits the results of her FBI exam.