An exotic visitor sparks mixed reactions in the firehouse. Tommy deals with the possibility of expulsion from the FDNY and a new sponsorship role in AA. As Mike and the guys renovate their new bar, Sheila learns that being a big sister isn't always easy.
A billionaire's son disappears after crash landing a small plane in the woods. Kim Marcus returns and her relationship with Martin develops.
Jim becomes intrigued by Cheryl's raving about a yoga teacher so he decides to try out the class, only to end up impressed by the teacher. Both Jim and Cheryl end up taking separate private classes to relax from their busy family life.
Jim is convinced that an old flame wants to get back with him until he realizes that she wants to hook up with Andy, leaving Jim with a bruised ego.
After months of demanding training, the 'battle-ready' troops of 1 Platoon, Mike Company, 3rd Battalion, Royal Canadian Regiment finally arrive in Afghanistan - their home for the next six months.
Kelly and Silver are shocked when Donna arrives in town. Annie and Dixon take a road trip to visit someone from Dixon's past while Ethan spends his spring break working for Habitat for Humanity. Naomi also decides to work for Habitat when she learns that Liam will be there.
Whilst bossing everybody about during rehearsals for the nursery's talent show, diva Yabba loses her voice. Yabba is crestfallen that she may not able to perform, but Timmy saves the day by performing for her.
Harry loses his cool with 3 swimmers that he's forced to rescue just seconds after warning them not to swim in a dangerous area. However, calling them "imbeciles" and "idiots" puts him in hot water.
The devil wants Morgan and Sam to spend more time together; Sam tries to get Andi back.
Ian becomes angry with Liam when he discovers that he has been skipping school. He soon finds out that Danny is responsible for Liam's absence and suspects that there is more to this than meets the eye. Patrick goes cold turkey and faces his demons, but can he come out clean and make a fresh start? And although Mimi faces an uncertain prison sentence, her main concern is Patrick's past infidelity. With Joe recovering, Mandy is under mounting pressure from all sides to leave him, but the decision is hers alone. And Meena takes her modelling career in a raunchy direction, much to Yvonne's disapproval.
A business theme features Ramona busy on her skin-care line and throwing a showcase party for the product. Meanwhile, LuAnn meets with a writer to finish her book; Bethenny promotes her food fare; and Kelly works on her jewelry business in Los Angeles. Meanwhile, Simon hopes to add a special touch to Alex's birthday.
As the squad investigates a fatal shooting by an elderly woman, Leon Cooley’s execution date arrives. Grace, who has discovered that Leon once helped her sister and was invited to a family birthday party, struggles with whether or not to lend a hand towards stopping the execution. Grace also finds a connection with a young woman, who may also be getting visits from Earl. And Ham’s divorce is finalized, which he hopes will make things between him and Grace more permanent.
As Nathan, Claire, Peter and H.R.G. help Angela uncover her past, she reveals the dark secrets that have haunted her for years. Meanwhile, Mohinder learns of his father’s involvement in a long forgotten government operation.
A second Stan shows up because of Kronis' wormhole and Charlie must find and stop Kronis before people start noticing there are two Stans.
Jack Bauer endures the elements and fights on to prevent an attack that could change the country forever. As the catastrophic blow to the nation nears, Tony Almeida operates from the field and Kim Bauer, who was last seen in Season Five, returns. Meanwhile, the stakes are raised when the administration is faced with a blackmail scenario.
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Charlie's desperate to make sure Chelsea and Evelyn don't befriend each other following their first meeting.
Cameron postpones her vacation with Chase in order to ask House to accept the case of an environmental radical who collapsed at a protest with unexplainable symptoms. Although suspicious of her motives, House agrees. Since she pushed him to take the case so emphatically, House forces Cameron to take the lead and run many of the tests on the patient. Meanwhile, House is unsure of Wilson’s new healthy diet.
After Chuck's father Steve is kidnapped by Fulcrum, Chuck learns the only chance he has to find him is by putting his trust and life into the hands of the person he trusts the least—his ex-girlfriend Jill Roberts. Meanwhile, the Buy More team tries to sabotage Emmett’s corporate evaluation.