Meredith, Cristina and Bailey come to Lexie and Sadie's rescue when a routine surgery goes horribly wrong, as Owen and Derek treat a man seriously injured while sleepwalking and Mark comforts the sleepwalker's distraught daughter.

Earl loses his list when tornadoes blow through Camden County.

Chloe and Jimmy have unexpected arrivals at their ceremony. Oliver is shocked to see Lana after expecting to find Lex. Lois and Clark begin to fall for each other.

The merged Nobag tribe returns from Tribal and Corinne realizes that she and alliance are in danger of being voted out as long as Kenny and Crystal remain strong. So Corinne and Randy want to get Matty on their side. Meanwhile, Bob shows Sugar the fake immunity idol he made in a possible strategic move. During Bob's second time on Exile Island, he decides not to take comfort but realizes the clue is the same as before. So instead, he goes on a walk around the area. Back at camp, the "Kenny-Crystal alliance" discuss voting out Bob or Randy. Meanwhile, Randy reveals a plan to annoy everyone else and get Bob's "idol" to save himself from being voted out. Before Tribal Council, Randy thinks everything is going according to his plan.

Marc and Betty compete against each other for the Young Editors Training Program but only one spot is available. Daniel learns he is drawn towards Molly. Wilhelmina attemps to get Connor to notice her.

As Kath shops for her wedding she meets up with a gay couple. The loss of Kim's cable leads to a reunion with an old high school classmate and Phil is having doubts about himself.

The CSI teams investigates the death of a woman, married to a man who committed murder twelve years ago. In the meantime, the fate of Natalie Davis is being decided...

A mysterious person in the office has made a huge mess in the microwave and will not clean it up. Meanwhile, Michael has to come to terms with the fact that there have been certain personnel changes in his staff without his knowing.

"I'll Kill her gentle". The angels want Anna dead, so Sam and Dean go on the run with the frightened girl, determined to discover the secret that has set the furies of Heaven on her.

Sante La Brea, a restaurant in Los Angeles, promotes itself as being a place that serves healthy food with a fun and welcoming decor. However, when Gordon arrives, he finds imitation seafood, spoiled food and a lack of customers. All of these elements combined, along with a disrespectful staff, put the owner Dean in major financial trouble.

Liz joins Jack to a party at his friend Gavin Volure's mansion, only to have Gavin fall completely in love with her. Tracy fears his kids have sinister intentions when they become too nice to him. Kenneth entrusts Jack to invest his savings into Gavin's business venture.

Gates goes out looking for a homeless war hero and upsets Sam. Neela's med student gets the entire surgical department into a lawsuit. A couple comes into the ER after an attempt was made at burning down their home. Brenner gets into a fight with a patient, and later confesses a secret to Morris.

In the season finale, Charlie gets the gang to help him put together a rock opera based on his song "Nightman."

Sam Tyler learns his father may be involved in the kidnapping of a prominent family's child. As Sam and the detectives investigate the case, he realizes he may have discovered why his father had left town in 1973. As buried memories of his childhood begin to surface, Sam believes he might have been sent back in time to help his father and to prevent him from leaving.

An attack of a DARPA funded lab for the development of super soldiers is attacked and chimps are killed and a researcher is injured by what looks to be the star chimp. DARPA asks Hood to look into it given he has no stake in the project. Judd Nelson plays the lead scientist on the project. While Hood is investigating more problems begin to happen to the project members including an unauthorized participant a Sgt. in the U.S Army whom Dr. Nesic has been treating for PTSD but in actuality giving him the super soldier serum. As the investigation goes on it looks like a cover-up is in the works.

Sarah reconnects with her father when she discovers he is not dead. Meanwhile Brian spends an absurd amount of money on a DVD and tries to justify his purchase by watching it over and over.

When Ron and Peter face their deaths, they come to the realization that they haven't lived a full life.

Richard Belzer

Tonight Stephen welcomes economist and author of Hot, Flat, and Crowded: Why We Need a Green Revolution--and How It Can Renew America, Thomas Friedman.

Douglas's neglegance in running the company nearly ruins Reynholm Industries. Meanwhile, Jen has a builder over at her house to do some renovations. When Roy seems to remember the guy from being on a TV show "Builders from hell", Jen get a bit nervous.

The popular news quiz returns, with guest host Jack Dee, and guest panellists Miranda Hart, Quentin Letts and Frank Skinner.