When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.
Robert fails a drug test but is determined to prove his innocence. Meanwhile, the Hammersley uncovers a smuggling operation by Samaruian rebels which is designed to destabilise the government.
Nathan and Haley throw a birthday party for Jamie. Deb hired a clown, and Haley is not happy with it since it's a creepy one. Lindsey returns to Tree Hill for Jamie's birthday, which gives Lucas hope that the relationship will be rekindled. When Dan arrives, Deb's mood swings fast and in the meantime Brooke and Peyton attend the party with baby Angie.
Jean is severely injured, which causes Kris and Junior to postpone their marriage plans.
Paige and Griffin's relationship isn't easy--especially with some disturbing secrets.
While visiting four of the Cook Islands, Scott is challenged about his commitments to the year trip while Justin learns from the locals how to live off the land. That is until his love for animals is challenged by "the head hunters" – the local school boys, who take the guys on a traditional pig hunt.
Inside an Indiana dairy farm, Mike learns how to milk a cow and use a blow torch to clean her udders. Then, Mike gets the inside scoop on how to inseminate a cow. Finally, he gets an up-close look at fatherhood as he helps deliver baby calves.
Sam is going to Todd's photo exhibit, but doesn't want to go alone, so she asks Craig, whom she thinks is a complete stranger, to join her. Sam soon gets the hint that they've met before and things doing go smoothly. Kevin discovers a demeaning picture of Sam in Todd's photo collection.
Alan makes wedding plans for Evelyn and Teddy, while Charlie figures out how to get more acquainted with his future step-sister.
Moz is a drug dealer and has very strange clientele who come and go from his flat.
After a body is found in a sinkhole, the team's investigation into the victim's death leads them to a robbery where the target is keeping a shocking secret.
The accidental excavation of a human hand leads the cold case squad to the cover-up of a major incident.
A woman's car is run off the road and she is killed, but her baby miraculously survives the accident. Booth and Brennan go to the woman's hometown to try to find out who's responsible for running her car off the road. Bones, with help from Booth, takes care of the baby until the team finds out who killed the mother.
Allison meets Meghan Doyle, Joe's new business partner. Meanwhile, her old car stops working and Joe surprises her with a nice looking used car. The car ends up being the center of a horrible unsolved crime though.
The girls go out to find a new home. When they find one, the guest list for the housewarming party is subject to more than just one fight.
Chris' attempt to be a "cool" kid lands him in hot water when he is caught with cigarettes and is suspended from school. Kicking him while he's down, Tonya blackmails him when she finds out before their parents do. Meanwhile, Rochelle decides to teach Julius a lesson.
In an attempt to solve Scotty's financial issues, Kevin offers to file domestic partnership papers with him. Meanwhile, Nora meets with an interior decorator in an attempt to try and make a fresh start and the Walkers' attend a fundraiser for cancer research.
Brian, afraid that he may have lost his last chance at love, searches for a former flame, Tracy. To his surprise, he discovers that he is the father to her son, Dylan. Tracy decides that Brian should raise the boy, and she drops him off at the Griffin's house. When Dylan runs rough-shot in the house, Brian's attitude towards parenting doesn't settle too well with Lois and Peter.
Zoey's Physics teacher decides to take the class on a field trip to go on a roller coaster, and all the students are ecstatic, except for Michael. He's got a big problem, but will the gang be able to help him out, and will Lisa stand by his side?
The demonic Shredder has transformed New York City into a nightmare version of Feudal Japan and the rest of the modern world is next! But the Turtles have a plan, and if it takes allying themselves with some of their former enemies to bring the fight to the Shredder, so be it... because if they fail, all life as they known it will cease to exist.