The new principal, Mr. Edwards, decides that the best way to solve the issues between Chris and Caruso is to have them become buddies on a school field trip. When Rochelle's favorite earrings are missing Tanya is the prime suspect. Julius tries to find a Wayne Gretzky jersey for Drew.

A media frenzy ensues as TNT&G attempts to prove their client, a dot-com billionaire, did not murder his wife after she disappears from their yacht and is found washed up on the beach half-eaten by sharks.

When Richie wins a playdate with Christine's latest crushhis teacher, Mr. Harrisa pre-planned trip with Richard forces Christine to confront her crush head-on.

Zavatti gets some new competition.

In an effort to get Hank to shut up, Wanda and Brent convince him that the internet is the way to go, so that he can fully express all his thoughts. Things get difficult for Brent when he tries to keep everyone up to date on what's happening in Hank's blog, and finds that 'cheat sheets' are just so last century. Lacey is upset over the success of her friend and the food at The Ruby begins to suffer when Lacey feels that she just can't do anything right. Emma, in an effort to cheer Lacey up, invites Lacey to a BBQ, where a cut-throat game of horseshoes takes place. Wanda tries to help Davis save money on his taxes, but things don't go quite as planned.

After hijacking a blind date, Ethan finds himself in a precarious situation when he develops feelings for a girl who thinks he's someone else. Meanwhile, Duncan reunites his high school band Car Fire and invites Nicole to see them play at a bar. Nicole can't decide whether to attend a charity event on Yonk's behalf or reunite with her high school pals. Also, Richie and Lina grow closer when they have their first successful date at Duncan's gig.

Marshall goes on his first real date post-breakup with Lily. Not only do Ted and Barney try to warn him that this girl has got the crazy eyes, but Lily decides to do everything she can to find out about this her and break them up. Also, Barney gets a new name.

A minor argument escalates into a major locker room rift between Jason and Malik that affects their playing relationship on the field. The locker room tension spills over to Kelly and Tasha, leaving Melanie in the middle and in an awkward position when she insists that they all come to her house for a dinner party. Pooch Hall also stars.

Niki opens up to a friend when her son becomes the subject of a crisis. Hiro overcomes his doubts about his heroism. Nathan and his wife come up with a strategy to win the election and Peter provides some unexpected assistance. Claire finds out what happened to her missing video tape. Matt and Audrey continue their investigation of the serial killer Sylar.

Michael and Sara find each other in New Mexico, but Mahone finds them both. In Arizona, Lincoln and LJ get into another auto wreck. And in Nebraska, Sucre tries desperately to get in touch with Maricruz by phone.

Berta's daughter, Naomi is pregnant and Berta drags Charlie with her when she confronts the babys father. Alan reveals a secret fetish.

Cesar works with three families, one farm dog who bites tires, an urban dog who is afraid of walks, and a suburban dog who is afraid of the noise of an air compressor.

The Teutuls begin work on their next project, for the Lugz footwear company; OCC bids farewell to a valued employee.

After an accident where the driver was decapitated during a dangerous stunt, the evidence leads the CSI's to believe it was more than an accident. While gathering the evidence, the CSI's find they must go into the world of sideshows.

Members of the Studio 60 staff travel to Nevada to get Tom out of jail and make it back before Friday's taping. There they encounter a judge who isn't a fan of the show and his disdain for the show interferes with their plan to get Tom before taping starts.

Tonight comedian Jerry Seinfeld!

Tonight Stephen welcoms ABC News correspondent and co-author of The Way to Win: Taking the White House in 2008, Mark Halperin.

Jac impresses Lord Byrne but alienates Joseph while he is at it. But Jac then tries to charm him when she realises she needs him. Abra's kidney transplant patient returns to Holby.

Horizon explores the H5N1 bird flu virus and its potential to mutate into the next human pandemic flu virus. In 1918 the Spanish Flu killed an estimated 50 million people worldwide. Invested are the ramifications of the fact that today, viruses can spread much faster thanks to air travel.