MI5 has to intercept a Russian arms dealer who plans to pass blueprints for a nuclear device to Iran. Adam and Ana decide to bring their relationship to a close.
Gibbs finds himself emotionally challenged when he agrees to investigate a crime connected to a friend of his daughter, who passed away years ago, and the investigation leads to a shocking conclusion.
Gang warfare has taken over the streets. Charles and Sage are its latest victims, and now the gangs are after Tay. It's do or die for Lincoln Heights. But someone has to make a move. Will it be the mothers of the slain who come together to fight for peace? Can Eddie, see past his fury to help take back the streets? When no one's looking, it's Cassie who steps up to light the way. Despondent over Charles, needing to do something with her grief, she stakes out her territory -- right in the middle of the gangs. Using art as her weapon, she starts painting her message of hope on a wall in a gang-infested vacant lot. Can Lincoln Heights rise to the challenge? Who will stand with Cassie?
Mike rolls up his sleeves and gets dirty in order to help create an artificial underwater reef. It's a dirty job that is helping to revitalize fish and coral populations in areas that have been devastated by pollution.
The Unit is in Lebanon when Charles is seriously wounded. They must think and act quickly to save his life. On the Home Front, Tiffy's problems continue to build when a man attempts to tow her car. The women stand up and fight to protect her.
Based on practically no information and no medical history about a mystery patient sent by the CIA, House is using some unorthodox methods to diagnose and treat him. Meanwhile the remaining candidates are questioning Foreman's judgment.
Jonesy keeps pranking Jen, much to her dismay, so Jen tries to get revenge on Jonesy by fighting fire with fire and pranking him badly. Meanwhile, Caitlin also apparently wins a contest from the bank that gives her money to spend. She then spends it on some diamond and earrings that makes Tricia believe that Caitlin working in the lemon is fake, which causes Tricia to stalk Caitlin. (Aired as a Viewer's Vote episode.)
Chris joins the school newspapers' writing staff but his skills as a writer doesn't go down well so he invents a scandalous story that goes too far when it accidentally causes a panic in the neighborhood.
The Young Hollywood party finally happens and Whitney is in charge. Heidi celebrates her 21th birthday with Spencer. And Audrina might have a new admirer.
Maria (Yasmine Paige) finds herself taken back in time by the alien Graske to a pier in 1964. There, she meets a young girl her own age called Sarah Jane Smith (Elisabeth Sladen) who, with her friend Andrea (Jane Asher), is about to embark on a fateful adventure. Taken by the Graske again, Maria is then reunited with the present-day Sarah Jane. But with them both trapped in limbo as part of the meddlesome Trickster's plan to wreak chaos, they are helpless to stop the huge meteor which is about to crash into the Earth. Maria's dad Alan is the only one able to remember Sarah Jane and Maria and faces a struggle to bring them back in time to save the world.
Maria (Yasmine Paige) finds herself taken back in time by the alien Graske to a pier in 1964. There, she meets a young girl her own age called Sarah Jane Smith (Elisabeth Sladen) who, with her friend Andrea (Jane Asher), is about to embark on a fateful adventure. Taken by the Graske again, Maria is then reunited with the present-day Sarah Jane. But with them both trapped in limbo as part of the meddlesome Trickster's plan to wreak chaos, they are helpless to stop the huge meteor which is about to crash into the Earth. Maria's dad Alan is the only one able to remember Sarah Jane and Maria and faces a struggle to bring them back in time to save the world.
The stakes have been raised as each player enters the game for $500,000 as a new line-up takes over on High Stakes Poker. Guy Laliberte makes his High Stakes debut and is joined by Antonio Esfandiari, Sammy Farha, David Benyamine, Patrik Antonius, Jamie Gold, Barry Greenstein, and Doyle Brunson for this $300/$600/$1,200 No-Limit Hold'em cash game.
The investigation into a runway model's death leads Horatio to his son and his nemesis.
After still being convinced that Maya is not dealing with her loss, Joan decides to take Maya on a shopping spree to help her recover but surprisingly, Joan realizes that she is the one who needs therapy because of Aaron departure to Iraq. Meanwhile, Monica tells William that she is pregnant but his reaction is unlike she expected.
Barbara returns to town with news that could have Russell very happy.
Since Samantha has no memories of the past, including her sexual experiences, she is faced with the decision of waiting this time for the right guy to come along, or to experiment.
Aspiring fashion designers compete for an industry breakthrough. Each week, a designer is eliminated from the competition after exhibiting their work in front of a judges' panel.
After Alan and Charlie have a fight about Alan's role in the house. Alan packs Jake up and moves in with his mother.