Alan feels Charlie is unable to control his womanizing ways.
In the final 30 minutes before Brent turns 40, Wanda tries to pull off a fireworks display for the occasion that goes terribly wrong. Lacey and Emma disagree over just who should be baking Brent's birthday cake, and Brent is dismayed to discover that his special bottle of scotch has gone missing.
Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.
Robin's musical past emerges again as the group learns of someone named Simon from Robin's past. Barney searches for more Robin Sparkles memorabilia.
Nathan and Haley have learned from the mistakes with the nanny, so they decide to interview potential nannies or mannies, but it goes in a completely different way. Meanwhile Brooke still wants to go ahead with adopting a baby. Mouth and Millicent take a new step in their relationship and Quentin must reconsider his intentions.
Having been recently dethroned as Queen Bee, Blair returns to school with the support of Serena to find she is still on the outs with her old friends. Dan visits his mother over spring break, and when he returns, Jenny is on the verge of becoming a full-fledged member of the A-List crowd. Jenny must go to dangerous and even illegal lengths to fit in. Serena struggles to adjust to living with Chuck, and receives disturbing packages from an unknown sender.
Allison has visions of a friend of Scanlon and Lynn DiNovi dying in a home mishap. This causes her to struggle with connecting some recent "accidental" deaths, consequently putting her own health in jeopardy.
Lauren and Lo are looking into the real estate market as they plan to buy a house. Meanwhile, Audrina reconsiders her situation as a single woman.
A lawyer is run down by a car, then a man is shot down in a cafe. The only common link was that they were both caught on camera in a pedophile sting, and the team hunts for a vigilante.
The Cold Case team investigate the mystery surrounding human remains found in an urban canal with links to the murder of a prison governor.
All team members are working to identify the bones from a college athlete who suffered a lot of fractures. After the body is identified they talk to his sister and somebody who acted as a sort of an adviser for the deceased. Angela and Hodgins have an important talk. Zack is overwhelmed by having to reconstruct the crushed bones to form a skeleton.
Contestants must compete against each other for a chance to win $500,000 in a house wired with cameras and microphones, capturing their every move for a TV and Internet audience.
In retirement John Adams laments the perils of a long life; loss of loved ones and growing irrelevance. But out of tragedy John rekindles his broken friendship with Thomas Jefferson and lives to discuss John Quincy's ambitious presidential agenda with him.
While Robert and Kitty visit a fertility clinic, Rebecca and Justin decide to have DNA tests to see if they really are related.
Shredder begins to build a new dynasty in New York, transforming the whole island into a hellish nightmare.
It's Earth Day in Bed Stuy and Chris decides to collect cans because he believes it will be easy and that he can get Julius to help. Meanwhile, Rochelle is called into Tonya's school for inappropriate behavior and realizes just where Tonya's attitude comes from.
May 1945. Foyle joins a municipal committee that's preparing for the now imminent V-E Day celebration but soon finds himself investigating the deaths of two of its members.
Wyatt has a fear that Marlowe could break up with him after they've gotten on each other's nerves for a while. Caitlin meets a cute boy named Calum at a party and later realizes he's a nerd so she writes him a fake phone number, but she writes the number on the back of her very own Khaki Card, on which she saved shopper's card points since she was 14 years old. So Caitlin needs to find a way to search for Calum and get her Khaki card back.