When Carol discovers her best friend Lillian had an affair with her husband back in the seventies, she takes revenge by reporting her to the DSS for benefit fraud. Frank Gallagher, who has been posing as Lillian's dead husband and claiming his benefits, comes under suspicion.
Alan and Denise take on the case of a young girl whose father killed her mother after finding the mother's whereabouts through her HMO's website. Catherine Piper comes back into Alan's life - by robbing convenience stores. Beverly Bridge, Denny's fiancée, flexes her muscle around the firm -- meanwhile, Brad attempts to manage the situation for Shirley and Paul. Daniel goes in for chemotherapy, and attempts to shut out Denise.
The Mala Noche strike again and it's up to the CSIs to bring them down once and for all. Also, MAJOR secrets are revealed about the characters and their love lives.
Now that Nolita has changed hands and Jack and Mimi are in charge, Nolita is nominated for an EPICURE Award. However, Jack soon realizes that Becky's restaurant is also nominated for the same award prompting a series of mistrust and hostility towards Jack for welcoming her back into his life. Seth finally discovers Jim's indiscretion and Ramon sees the Virgin Mary in a Prize Lobster.
Jack returns to CTU and has an emotional reunion with Audrey, while Curtis tracks the Russians and the stolen nerve gas. Walt sends in a hit man to silence Jack. Chloe discovers that Spencer has his own agenda at CTU. Walt convinces Logan to have Martha institutionalized when she tells them of the attack on her.
Sheppard's team meets a civilization about to be destroyed by a super-volcano, and is trapped there when the Stargate is destroyed during the evacuation.
Ted finds a new woman at the wedding. They want to remember the evening so they don't exchange last names or numbers; but Ted takes a big fall when he tries to find out her name.
Charlie finds himself in a relationship that is not based on sex.
Loyalties are tested, old feelings reignite, and the threat of loss becomes all too real when Kris faces her biggest challenge yet. Meanwhile, Pablo receives a call that will rock Raintree.
Racism comes to light at the high school when Alex, a new African-American student, wants to give a report on Dr. Martin Luther King, but his teacher argues that they have already covered that topic in class. When Martin inadvertently supports Alex's case, he falls victim to a hate crime. His car is defaced with racial slurs, and he refuses to wash it off until the culprit is caught. Meanwhile, for her own report, Ruthie attempts to recycle an essay that she wrote three years ago.
Almost three million dollars have disappeared from Montecito. The gaming commission has to clear Casey's licence and the missing money becomes an issue. Despite being dead, it seems Monica still gets Montecito in troubles. A live weather report is to be aired from inside the casino, when the weatherman gets an allergic reaction, allowing Mike to take his place for one night. Danny and Mike is to find the missing millions, and the thief, no matter if the thief is dead or not.
Allison helps with the location of a missing child. Afterwards she gets a vision about the child's future and is not sure anymore what she should do to help the child.
When the entire population of Retroville is accidentally hit by Jimmy's shrink ray, the Space Bandits abduct everyone with the nefarious plan of marketing and selling them throughout the galaxy as living dolls.
After she beats him and his friends in a friendly poker game, Doug convinces his mother to try to enter a high-stakes tournament. Meanwhile, Carrie gets Spence to help her lose her accent to improve her chances of getting a promotion.
When Sam responds to a fatal stabbing at Crester's Textiles he's shocked to discover that it's the converted mill where he lives in 2006. Sam sets up a forensic investigation but Gene already has a hunch about the murderer. Sam believes he has to stop Gene from sending an innocent man down for life. But does he have more to learn about this world than he thinks?
High Stakes Poker action continues and Barry Greenstein starts to get involved! Daniel Negreanu, Doyle Brunson, and Ted Forrest join Greenstein for another High Stakes Poker cash game.
August 1942. Foyle investigates the a mysterious disease affecting local farm animals and looks into the arrest of a pacifist accused of stabbing a war hero.
Starr goes goth, and Jude goes goth as well to impress her. Meanwhile, the rest of the gang visits the movie theatre during a power outage at the mall.
Bartlet must deal with the possiblity of a nuclear explosion in California, Kate is keeping a careful watch on the election in Kazakhstan and China's response, Will is acting as the government's voice this week, and Josh is trying to keep his political version of Tourette's in check.
Shane opens her own styling business, and Bette loses her position as the sole provider for the family, forcing Tina to take up a job under Helena. Now back in L.A., Jenny introduces Moira to her surprised friends. Dana and Lara make plans to visit France while Alice still obsesses over Dana. Meanwhile, Kit is surprised by The Planet's new manager who wants to make some drastic changes to the place.