The Unit is called in to help out the local SWAT team when a prominent school in Virginia is taken over by shooters. They must determine how to free the hostages without the students getting injured. On the homefront, Lissy has a young man interested in her, which turns into a delicate situation as he is the son of an Officer. Kim further complicates this matter, when she defies Tiffy’s orders and Lissy pays the price.
On House and Cuddy's flight from Singapore a passenger gets ill and Cuddy suspects an epidemic. At the hospital, Wilson leads the team as they deal with a middle-aged woman suffering from seizures.
Kavanaugh acquires what he needs in order to apprehend Vic who is preoccupied with getting revenge on Guardo. Claudette finds herself under the political microscope as a result of the San Marcos incident, and Danny receives some news about her future at the Barn.
McGee is under high pressure during the murder investigation of a Petty Officer based on the character for his latest book, with very little information to go on.
On the second night of their investigation at Râşnov the team venture 200ft into a well, fabled for being built by two Turkish soldiers who were captured and spared death to build it. It took them 32 years to complete it, yet they were still killed for their efforts. Will the team uncover any ghostly truths behind the myth and, more importantly, will they manage to get out of the well again?
The origin of the magic veil and the Te Xuan Ze is revealed, Auntie Roon returns for a second time and plans to enslave humanity by turning June into a monster and breaking the Magical Touchstones. Jody becomes suspicious of June and Magic as Ray-Ray, Monroe, Dennis, and Lila try to prevent Auntie Roon from succeeding.The Final Episode
After a scalped body is found near a Native American casino, Horatio believes that the owners of the Casino and the County Supervisor may have had some involvement in the murder.
Ruby and Louise tries to learn the Hippity Hop Dance. Meanwhile, Roger teaches Max how to play football.
Carrie is convinced that Deacon and Kelly were only able to afford a vacation home by being cheap. Meanwhile, Arthur tries to help Spence get a new job.
Everyone gets in the action as Season 3 comes to an end on High Stakes Poker. Phil Ivey, David Benyamine, Antonio Esfandiari, Brad Booth, Patrik Antonius, Phil Laak, John D'Agostin, Brian Townsend, and Daniel Negreanu close out the season playing $300/$600 No-Limit Hold'em on High Stakes Poker.
Emerging as head of the 'hood, Tommy gets scammed while trying to evict drug dealers. Jimmy demands payment from Jenny; Nicky learns the Donnellys are behind Louie Downtown's disappearance.
Trying to send an e-mail to Barb about Mr. Harris, Christine ends up sending it to all the parents from school, nearly costing him his job.
Manny's parents want her to come home after the tragedy at Emma's house and to Emma's surprise, Manny agrees. She can't seem to tell Manny how she feels though, since Manny's got a spirit squad competition and a brand new boyfriend to balance. Emma can't hide the fact that she feels ignored and when she thinks her friend's death is being glossed over she decides she really doesn't have to hide her feelings. At all. Dylan has been absent, grumpy, and completely mute making Marco worry that Dylan is cheating again. Jimmy and Spinner are happy to help catch him in the act, but none of them are expecting what they find...
The future of the team is threatened and without having that to deal with, Sandra has to take drastic measures to prevent Jack from exacting revenge against the man who killed his wife Mary. Sandra also has the added benefit of trying to keep Jack’s actions from shady new recruit DCI Karen Hardwick while working on a 10-year-old murder case.
Five teenagers must locate and secure ancient relics with unbelievable power, while at the same time stop a demonic corporation who want the relics for their power.
To find the remaining suitcase bombs, both Jack and the President set up bluffs.
Robin attends Lily's bridal shower and finds the gift that she brought is out of place. Barney hires a stripper for Marshall's bachelor party.
Wayne must deal with legal arcana in an eminent-domain case and Dahlia gets a job for which she is equally qualified: a dental hygienist. Ginny catches up to the Malloys, which means Dale is probably not far behind.