Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.
Jane is reunited with his former nemesis, cult leader Bret Stiles, when the head of an anti-cult activist organization is murdered.
As Adele's condition continues to deteriorate, Richard considers altering their living situation; an explosion at a local coffee shop results in a busy day in the ER for the doctors; Callie takes Meredith under her wing by helping her study for her boards; Lexie joins Arizona and Alex in peds, as they continue to care for intern Morgan's premature son; and when Jackson snaps at a patient, Mark encourages him to find ways to relieve his stress. Meanwhile, Cristina lets her suspicions get the best of her.
A power play unfolds in Tallahassee when Dwight and Todd Packer compete to become Nellie's vice president. Meanwhile, Jim receives an unwelcome visitor, and Andy forces the Scranton staffers to work late.
Haley seeks help from Lucas as Nathan (James Lafferty) makes an escape attempt. Brooke comes face-to-face with Xavier. Juliain uncovers evidence that assists Dan in his search for Nathan. Clay makes a connection with another patient.
Frank has a fight over a baby carriage but makes a deal to exit his real estate investment; Frank's enemies get an unexpected lead on his location.
The kids have a meeting with Frankie and Mike about their parenting techniques, and they are thrown for a loop, when their parents attempt to change.
When one of their number disappears on the same day that an American girl joins their ranks, a group of English boarding school students embarks on solving a mystery.
This week, aliens are the artists' focus and guest judge Star Trek Next Generation's LeVar Burton helps out.
The BAU team investigates a series of brutal home invasions and murders in California's Inland Empire that appear to be gang-related, but their investigation may uncover a more sinister motivation.
It's a day of disturbing realizations when Mitchell manages to ruin one of Jay's proudest golf moments, Phil overhears something that may forever change how he sees his little girl, and Gloria stumbles upon Claire's dangerous little secret.
Asian Masters lend a hand in a tag-team-style Quickfire. The final 3 chefs must create a dish and cocktail that fuses the concept of fire and ice into one cohesive dish, a culinary testament of their journey from blazing Texas heat to blistering Vancouver cold.
When a house is stolen completely off its foundation, the CSIs are on the case in search of answers. Meanwhile, new CSI Julie Finlay showcases her skill in blood analysis.
When the four ninjas follow the mysterious falcon into the woods, they stumble upon a hidden workshop where Zane learns the secret about his past.
Jake and the crew help the Pirate Princess find the Dazzle Diamond so she can recharge her magic wand.
When Jill turns to the newly single Dallas for inspiration and support, her marriage to Noah goes on the rocks. Meanwhile Dallas begins spending a lot of time with her hot younger boyfriend, Yoni, which causes tension with George, and Dalia befriends Lisa to get back at Tessa for dating Scott Strauss -- so Tessa decides to take action and recruits Kimantha to make Dalia jealous.
Hank struggles to cope with Jack's illness; young brothers keep Hank busy; Evan teams up with Boris' cousin.