An ailing man suffers from blackouts and sleepwalks, leading the team to wonder if his sleepwalking is a symptom, or how the man is becoming exposed to something else. When the man's daughter grows ill as well, the team must provide a diagnosis before both die. Meanwhile, Cuddy adopts a newborn but when the birth mother displays a rash, she has to make a decision between putting the mother or daughter at risk.

The NCIS team is forced to investigate a crime during Halloween where a psychotic murderer leaves clues of its next victim's identity on the net.

Each of the family deals with their loss in his or her own way.

After recuperating from her health scare, Adrianna returns and tries to make amends with Naomi, but her ex-BFF refuses to forgive her for the betrayal. Adrianna makes a surprising connection with Navid, who helps her through her situation. Meanwhile, Annie and Ethan finally take their rapidly growing romance to a new level during the school's homecoming dance, causing Naomi to feel jealous.

The results are unveiled for week six. Michael Flately hits the stage as does the Pussy Cat Dolls performing with Missy Elliot.

This week, contestants put their food knowledge to the test during a calorie quiz that will give the winning team a dramatic advantage in the challenge. Later, emotions run high when one contestant confronts another on the opposing team before the challenge, which leaves the players soaring to new heights. Then one contestant stuns everyone with a record-breaking weigh-in before an elimination round sends another contestant home.

After Jay makes a surprise dinner that gets rave reviews from the kids, Rita starts to feel unappreciated.

Fractals are more than just pretty pictures. These simple but sophisticated equations describe the world we live in, from forest growth patterns to the beating of a human heart, and they are inspiring new investigation in myriad fields of science and technology.

Casey faces a hard decision when she learns that Max is planning to go to Cal Tech for grad school and she is offered an internship. She turns to Lauren Conrad (who appears in a dream sequence) for advice. Also, the pledges are put through Hell Week and Rusty is driven to face the challenge no matter what he is forced to do.

Mike teams up with the boys from Bartos Bait & Fish to catch leeches that will later be sold for fish bait. Then it's off to the Green Tripe factory in Hollister, CA where Mike helps make BARF (Biologically Appropriate Raw Food) for dogs.

Megan finally decides to reunite with her father and invites him over for dinner at the mansion. Meanwhile, Lily is caught by Sage in a compromising position, and Charlie and Megan's friendship may be over after the two have a major confrontation.

Jane uses his mentalist skills to help a suspect suffering from memory loss.

A baby with AIDS pulls Benson and Stabler into an investigation whose rules they're not familiar with, requiring Dr. Warner to lend her expertise uncovering a clinic dealing in bogus cures and murder.

The Barn is on the hunt for two fugitives. Aceveda encounters some obstacles to his quest to be mayor. Meanwhile, Dutch gets personal with a suspect's mother.

Martin is left to handle a MP case while the rest of the team must divert attention to a child kidnapping at the mall.

Jordan has a tough task of defending against charges of insanity. Eli is on a mission against lead paint manufacturers that may bring him before the Supreme Court.

Steve Martin

Tonight Stephen welcomes author Sherman Alexie.

When the half-naked body of a 12-year-old is discovered floating in a drainage ditch near his school, the team is called in, bringing Nikki back in contact with one of her former teachers, Noel Hopkins, now headmaster.

During Harry's preliminary examination they find clear signs of abuse, and when the police discover the victim was last seen with another boy, Liam, who has also gone missing, they fear he may have been abducted. Liam is still out there, the hope is that he is still alive, and the team, under increasing pressure from the police, must find clues from the dead boy's body in order to save the living.