A serial arsonist who targets the homes of upper-middle-class families as they sleep is investigated. The BAU determines the arson victims are linked together through corporate development companies that have been accused of building on contaminated land.
When a breakout of headlice hits South Park Elementary, Mrs. Garrison refuses to say which child brought the plague to the school. So, Cartman takes it upon himself to find out who it is so the kids can make fun of them. Meanwhile, a louse Travis, is desperate to save his fellow lice from imminent destruction from a conscious world.
A policeman, a lawyer, and a librarian with the power of psychometry all become involved in a twisting tale of murder and revenge that has links to their past.
When a sexual predator moves nearby, George and Angie use their membership in the neighborhood watch to take action in different ways. Angie advocates sending a certified letter to the offender and hanging posters around town....
This episode demonstrates the production processes for handcuffs, caulking compound, propane tanks and forensics, and shows how each is made.
The Unit travels to Israel to learn some new techniques in terrorist tactics and how to defend against these tactics. Charles becomes interested in a Sergeant in the Israeli Army, yet things turn very dangerous when they go off alone together. On the home front, Tiffy finds some WWII memorabilia and begins soul searching on what she should do with it.
When a supposedly frozen to death Marine turns out alive on Ducky's autopsy table, the NCIS team has to find out about the victim's movements last few days to uncover what happened to him and who left him for dead. As the investigation progresses, the team learns about the victim's trip to Baghdad via a private cargo plane and discovers a link to Gibbs' past.
Alan defends his ex-girlfriend Renata when she is accused of murdering her groom-to-be. And when the case starts going badly, she drops a personal bombshell in her defense that not even Alan knows about.
Brash, stubborn and resourceful ME Jordan Cavanaugh revives her career in Boston, occasionally breaking the rules and ticking off the cops or her co-workers. On the home front, she gets crime-solving help from her retired-cop dad.
A real estate developer is murdered, and the investigation uncovers a complex web of deceit involving his wife her two identical triplet sisters. But the apparently-murdered developer may have had a surprise of his own.
Lynn continues her work at the church after ending her affair with Eldon. William punishes his friends for interfering in his relationship.
When Dana witnesses an abduction that turns to murder, she turns to Eddie for help, but Jen is less than thrilled with the situation.
CTU's satellite tracking system is compromised as a bomb-carrying drone heads toward an unknown city. Meanwhile, US forces prepare for a nuclear retaliation on the Middle East.
Chris is a hit as a DJ after the neighborhood DJ gets arrested during a party. Chris has a problem when he scratches Rochelle's James Brown album. Julius passes out when he sees a rabbit at a magic show he takes Drew to.
Sara sacrifices herself for the safety of Michael so the brothers can get on with their final plan to attain freedom, but their plan gets 'shipwrecked'. Meanwhile, Bellick blackmails Sucre to partner up as T-Bag's streak of murder continues to the south of the border.
Barney takes drastic measures to prevent Ted from moving into Robin's apartment. Meanwhile, Marshall and Lily are discovering the ups and downs of having the apartment to themselves. Barney considers moving in with Marshall and Lily.
Joey Ice Cream meets his long-suffering prison counselor, Mr. Happy Harisson, who unlike his name suggests, is the world's biggest pessimist, getting more and more frustrated as Joey continues to tell lie after lie. When Tommy tries to cash out the rest of his tuition money, he is informed that someone has already canceled his tuition.
A divorced mom tries to keep pace with everyone around her.