Ryan travels to Mexico--with a stubborn Seth in tow--to put an end to his turmoil in the only way he knows how, but he comes up empty in quest for revenge.
Taylor's ex-husband, Henri-Michel, gets a little too close to home while promoting his erotic memoirs. After Henri-Michel tells Ryan about Taylor's exciting life in France, Ryan questions his own relationship with Taylor.
When the team takes on the case of Emily, a six-year-old girl who has numerous preexisting health problems, they must work with her mother Elizabeth (guest star Jessica Collins), who happens to be a doctor herself, specializing in her daughter's condition. The team must also deal with the battles raging between Emily's mother and father who have conflicting views on how to handle her health issues.
The whole gang is invited to Chrismukkah at the Cohens' house, but Seth's favorite holiday is nearly ruined as secrets are revealed that will change the Cohen family forever. Summer, Marissa and Ryan make a plan to save Chrismukkah.
Marissa tells Julie that she and Alex are dating and decides she has to get out of Caleb's house. Summer is faced with a big decision as she prepares to go to Italy with Zach. Ryan convinces Lindsay to take the paternity test, and everyone anxiously awaits the results.
Since Carter's departure, Kirsten has been drinking and when Sandy questions her he's left to sleep alone in the bedroom. Marissa's nervousness around Ryan leads him to wonder if something has happened between her and Trey. Summer, tired of Seth and Zach behaving foolishly, confronts Reed about the graphic novel.
Taylor ruins Seth's night by keeping Summer away. Marissa's new friendships at public school worry Summer. Sandy forms a new partnership. Charlotte manipulates Julie and Kirsten.
Summer discovers the truth about Seth. Sandy and Matt encounter an obstacle to their hospital project. Kirsten and Julie take their matchmaking business a little too far, causing Julie to go into hiding. Marissa finally tells Johnny how she truly feels.
With graduation just weeks away, Ryan, Seth, Summer and Marissa leave Newport to attend their respective pre-freshman orientations at Berkeley and Brown. While dropping the boys off at the airport, Kirsten is surprised to see Theresa and her familiar-looking baby boy.
A long vacation is just what the doctor ordered for Bethenny and Jason but the ups and downs that come with it are not. On the second leg of their trip, Jason decides that he has waited long enough to break some news about their new apartment and where they may have to live before they can move in. Willing to put themselves out there again, literally, Jason and Bethenny find themselves on yet another boat ride from hell.
Will fails to remember Sasha's birthday, so Brown and Cora help him make amends. Brianna lands a new boyfriend and seeks Cora's romantic wisdom.
Cora provides helpful words of wisdom to an insecure plus-size student. Derek helps Brown produce an exercise tape.
Navy Seal Craig "Sawman" Sawyer meets up with Marksman Jaime Franks as they put blazing fast, automatic rifles through a series of tests and challenges. The final shoot off pits old vs. new to determine the Top Gun.
Richard Hammond gets down and dirty at the Denver Regional Landfill where he learns how to operate three trash machines - the Compactor, Scraper and Bulldozer. The Bulldozer is used to spread garbage so the other machines can work properly, it can push up to 22 tons of waste. The Compactor, which weighs more than the last 11 Super Bowl championship teams combined, is used to crush the rubbish. Lastly, the Scraper covers the refuse and can hold up to 40 tons of dirt.
One of most destructive forces in WWE history, Brock Lesnar, reveals his intentions to inflict torture on John Cena. In the mean time, Cena must contend with the 350 pound Lord Tensai in an Extreme Rules Match set up by Raw GM John Laurinaitis. CM Punk defends the WWE Championship against Mark Henry, while Chris Jericho takes his character assault on Punk to a new level. All this and more as Raw Supershow invades London, England!