The prosecution of a drug trafficker responsible for a stash house massacre is hampered when McCoy discovers that the defendant claims diplomatic immunity, and has been working as an undercover operative aiding the U.S. military in Afghanistan.
The 14 hopefuls all meet up in New York and are given their first assignment: Innovation. Taken to a place where they are to get their materials, the designers are shocked to see it is a grocery store. They have a budget of $50, one hour to make their purchases, and one day to complete their designs.
The roommates get a surprise family visitor. Toot, Wooldoor and Xandir abuse Ling-Ling.
Claire has a horribly realistic nightmare about her new baby being harmed or kidnapped. Flashbacks reveal Claire's backstory: the former boyfriend who got her pregnant, then abandoned her, and the psychic who convinced her to take the ill-fated flight that landed her on the island. Hurley is shocked and confused when he discovers that Ethan Rom (guest-star William Mapother), another plane crash survivor, does not appear on the flight manifest.
A Luthorcorp experiment is released into the atmosphere - a toxin that causes its victims to hallucinate their worst fear. Chloe, Clark, Lana, and Jason all fall fictim to the toxin, and Lex, desperate to find a cure, takes a dangerous antidote. Meanwhile, Lionel is released from prison and his conviction overturned thanks to a mysterious benefactor.
After mounted officer Valasquez is shot down in the park, Mac goes looking for the bullet that killed the officer only to learn that it is lodged in the horse's spine and cannot be removed without being fatal to the horse. The investigation leads them to a local street vendor, but stalls when the D.A. asks Mac not to do anything to risk the horse until after the woman who donated it has a chance to say goodbye. Aiden investigates the body of a young man, Lenny Starks, who was found face-down, dead in the street. Aiden traces the young man to a local pizza parlor where she faces intimidation from the bookies who use it as a gambling front.
All the fourth grade girls idolize a rich, famous and spoiled socialite. They even have her brand new toy set that comes complete with video camera, night vision filter, play money and losable cell phone. In an effort to impress their idol, the girls pursue the boys to make their own videos.
Hyde joins the disgruntled group of guys that can say "Kelso Slept With My Sister", much to his displeasure. Donna plugs a calender on the air for Red's muffler shop until she discovers it is full of scantily clad babes on hotrods. Kitty once again tries to teach Jackie how to bake, with disastrous results.
Bobbie gets Joey a job as a celebrity judge for the Miss Southwestern U.S.A. pageant, taking place in Las Vegas. With Gina, Michael and Alex in tow, he heads for Vegas. While there, Alex reveals her Celine Dion obsession, Michael teaches Gina how to count cards, and Joey accidentally sleeps with a pageant contestant.
Nathan is concerned about Lucas' health, so he tells Karen that Lucas didn't take the heart test. Dan offers Keith to continue working at the dealership-as vice president. At school, Peyton must confront the rumors going around that she is a lesbian. This affects her friendship with Anna. As for Nathan and Haley, they begin to grow apart...
A strange case for Gibbs and his team opens when a Navy Commendar dies after successful surgery. While researching through commander's past, the team finds out that he collected a lot of enemies lately and tracks down a ensign making him the prime suspect. Soon Abby realizes that they got the wrong man...
Ever since the trauma of the shooting, Emma has been distancing herself from her friends and neglecting her typical interests. Emma discovers a scandalous secret when she goes to the ravine with Jay but instead of turning everyone in, Emma decides to join in on the raunchy ravine activities.
Cheryl's gynecologist (played by Mitch Rouse) forbids her from having sex with Jim until the time is right to get pregnant, and Jim eats crow in order to win a huge account from a blowhard potential client (Tom Arnold).
After arguing with Benson about their personal lives, Stabler enlists the help of a former cop turned psychiatrist in apprehending a serial rapist and murderer who attacks disabled women.
Jones becomes a murder suspect after Michael's father is shot to death; and Ortiz and Murphy investigate a molestation case that might involve a priest; Medavoy gets his hearing in trial court.
The day-to-day lives of three orphaned children who are adopted by aliens that have trouble adjusting to the local culture.
When George mistakenly thinks he is going to be named VP of Powers Brothers, he whips out his "VP Dance", only to find the company has merged with another corporation and jobs such as Benny's and Ernie's need to be cut. Plus, George is appointed a new co-manager, a beautiful and cunning woman who George fears will take his job.
The wealthy parents of a Neptune High senior hire Keith and Veronica to investigate a cult-like group and its charismatic leader after their son Casey moves out to live on the collective farm. Meanwhile, Veronica attempts to get to the bottom of Abel Koontz' claim that her real father is Jake Kane.