Brennan and Booth investigate the origins of a decomposed body that's been found in a local alley fully dressed in an unorthodox costume. They determine it's the remains of a reclusive teen that they discover has a secret second life.

Contestants chosen from around the nation arrive in Hollywood for their big chance at the American Idol crown. Faced with a grueling schedule, pressure-packed rehearsals and the judges criticism, some will survive and more will go home.

Freddie and Chris are both nominated as finalists for the title of "Chicago's Most Eligible Bachelor". They invite the other nominees to the restaurant for an informal get together and team up to scope out the competition. But, when they realize that only one man will be featured on the cover of a magazine, they become highly competitive and try to out-do one another to win.

Kolchak tries to figure out the cause of death of two office workers who are found mummified.

Brooke is forced to grow up in a hurry when her trip to a New York City fashion show prevents her from attending an annual cheerleading tournament. Nathan and Lucas are influenced by the father of an old friend. Struggling with her mother's cancer, Peyton joins Rachel for a night of blowing off steam, and Haley and Nathan use their hotel room as the honeymoon suite they never had.

In the two minutes that Veronica is in possession of the proceeds from the Winter Carnival for the senior class trip it all disappears. To clear her name Veronica must identify the thief among them. During her investigation she is surprised when she finds herself defending Jackie as accusations fly. Keith confronts his baseball idol and client Terrance Cook with questions about his past and the bus crash. Later, Dick tries to humiliate his brother Beaver in front of his carnival date, only to learn it probably wasn't worth the price he was going to pay for it. Logan sets his sights on a sophomore whose family may have a vested interest in how well Logan's legal problems go away or become more of a problem.

Makeover is what this challenge is all about. The twist, is that they will be making over each other. They will reinvent each other's look (including a hair cut if necessary and makeup) in two days and with $200. The names were randomly chosen by pulling names out of a bag to decide who would reinvent whom. Daniel Designs for Chloe, Kara For Santino, and Santino for Kara, and Nick designs for Daniel. Daniel has immunity from the last challenge, so he moves forward no matter what his design looks like, but he would still like to win.

Not only do they have the time constraint that they usually do, they have the added stress of giving some of the time they have to the person that will be designing for them, for measurements, fittings and hair and make up.

You're either in, or you're out, who was out this week... Chloe is the winner and Nick is Out.

Dave, Russell and Larkin are shocked after discovering the identity of their trespasser. Kira questions what happened to Mariel and her father from their time they had been in the water. Tom searches for the person who shot him.

Fontana and Green arrest a fellow student after a young man is murdered, but McCoy faces a tough adversary when he tries to prosecute the crime.

Some of the island survivors fear that "The Others" may have returned when Sun is greatly injured during a failed kidnapping attempt at her plant garden. Also, the trust barrier becomes very thin between Locke and Jack in terms of locking up the guns and being kept safe. Meanwhile, Sawyer is an amused but highly interested bystander when tension escalates between Jack, Locke, Kate and Ana Lucia. When Jack purposely takes Sawyer's medication from him he pushes more in favor of helping Locke. Lastly, flashbacks reveal more of Sawyer's con artist past.

TONIGHT: Actor and star of Firewall, Harrison Ford! Also, the first installment of "Klassic Kolbert."

TONIGHT: Stephen Colbert welcomes the author of The Case for Peace: How the Arab-Israeli Conflict Can be Resolved, Alan Dershowitz!

While Jackie goes on a date, Charlie finds himself flirting with beautiful guest Alice. Meanwhile, Anna is prepared to do whatever it takes to win over millionaire lawyer Richard, convinced that he is the man for her. Even if it means breaching the 'strictly no staff/guest relationships' rule.

Investigating the substances that make up the universe. Only four per cent of matter is recognised by scientists - and while some claim they know what the rest is made of, others believe there is a fundamental problem with the supposedly concrete theories of Newton.