As Kate and Sawyer journey back to the main island with Karl, who is exhibiting effects of the brainwashing video, they argue over whether to go back and save Jack. On Hydra island, as Juliet's fate rests in his hands and a power struggle within the Others ensues, Jack recollects the time he spent in Phuket, Thailand and his relationship with Achara, a mysterious tattoo artist.
The lives of Jake and Hawkins are explored during this flashback episode. This episode begins 36 hours before the bombs went off. Sarah is introduced and is associated to Hawkins. Jake had been living in San Diego.
In Miami, Ricardo John catches his first case as lead detective: a young woman apparently raped and murdered in a vacant lot. In Dallas, Detectives Scott Sayers and Kenneth Penrod investigate a home invasion that left one man dead and his fianc e critically wounded. The case hangs on whether the surviving witness can identify her attackers.
It's Prom day, and emotions are flying high at Tree Hill. An emotional Haley confronts Nathan about the sex tape and asks for a list of all his past sexual encounters. Meanwhile, an angry Peyton asks Lucas to skip the dance altogether, but he refuses to take no for an answer. Finally, Brooke and Peyton let out all their tension in a confrontation that can tear them apart forever.
The BAU travels to Houston to investigate a series of murders that have occurred near construction sites and abandoned buildings. Because the murders appear to be random, the team believes the killer could be a homeless person. Meanwhile, everyone is noticing an apparent change in Reid's behavior.
George, upset about being publicly humiliated at work, downs a shot of liquor along with the worm in it and hallucinates that he and Ernie are gay and about to be married to each other.
George has been hearing some strange noises from the neighbor's apartment upstairs. He figures that if The Man with the Yellow Hat lives with him, why wouldn't their new neighbor? But The Man is determined not to let George spy on the new neighbor to find out. George guesses that with a loud noise like the one he is hearing, the new neighbor has an elephant. But then George hears some different noises. What is that neighbor's elephant up to now and how can George get The Man to believe that an elephant is living upstairs?
The Man with the Yellow Hat has a hobby playing the tuba in Rescue Squad 86's firehouse band. George becomes excited at the thought of a band, but the Man will not let George play his tuba. George then decides to make his own instruments and that his animal friends will be the ones playing them. The only problem is that his animal friends seem to get distracted too easily and, after causing a loud racket on the roof of the apartment building where they are practicing, someone calls the fire department.
Alan tries two different cases, including the defense of a therapist who was fired for his belief in UFOs. Meanwhile, Clarence is confused by Claire's dinner invitation; and Bethany tries to bring out Denny's spiritual side.
Stabler finds himself drawn into a case where a young mother has committed suicide after her baby goes missing. The case leads to questions for Benson about her own family history.
To raise money for new toys, Henry decides to sell his parents' belongings to his friends, and sells Peter to Margaret as a 'slave'.
An investigation into the murder of the wife of a televangelist leads to the discovery of a seedy relationship he had with a hustler that may have contributed to the crime. Meanwhile, Goren runs into his brother while visiting his ailing mother.
On an assignment to return a career safe breaker from prison for further questioning, Tyler, Ray and Chris are attacked by robbers and the man who they were taken in for questioning is broken out. Is a local gangster to blame, or is there more going on than meets the eye... specifically, was the crime actually arranged by Gene's old mentor? Meanwhile, Sam tries to break in the first black detective in the department, a man who will later become Sam's mentor when he first joins the police force.
To catch a predator shows us the investigations carried out using the hidden camera from Dateline NBC.
Explosions across the estate spark fears that Chatsworth is a terrorist target. But it has the Maguire's worried that they're under threat from folk a little closer to home when Patrick finds the family semtex missing. Meanwhile when Frank reveals to Monica she was never his first choice over Sheila, Monica vents her anger by turning to Norma for gifts and goodies.
Lucy has trouble sleeping. Willa teams up with Don to uncover a secret celebrity wedding. Julia deals with rehab while Holt deals with his career.
When Veronica is released from jail, she is contacted by Josh Barry who is desperate to prove his innocence in his father's murder. Meanwhile, Keith gets bittersweet news from the county commissioner, and Logan helps Mac and Parker on a scavenger hunt.
This episode demonstrates the production processes for CO2 cartridges, pretzels, scissor lifts and skating rinks, and shows how each is made.
The team participates in a unique competition known as the CT Games that puts them up against other Special Forces units from around the world. Things take a bad turn when one of the teams appears to be taking things too far to win. Kim must travel to Utah to save her job and finds herself meeting an ex-lover. She spends some time getting reacquainted with him.