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Contestants tackle obstacles while they are terrorized by yetis.

As Adele's condition deteriorates, Richard considers making a change; an explosion at a coffee shop results in a busy ER; Callie helps Meredith study; Lexie helps Alex and Arizona care for an intern's premature baby.

Sam struggles to take care of his sister; Sheldon finds out that Amelia has life-altering news; Addison and Jake continue to flirt.

Sheldon's routine is turned upside down when his barber gets sick; Wolowitz questions his decision to go into space.

When Rosa kicks Hector and Fernando out, they crash Rob and Maggie's romantic weekend at home.

When the leader of an anti-cult activist organization is murdered, Jane is reunited with a former nemesis, Bret Stiles (Malcolm McDowell).

Elena, Bonnie and Matt throw Caroline a party; Damon and Stefan butt heads over how to deal with Klaus; Bonnie learns of Jeremy's plans; Tyler refuses Klaus' latest demand.

Dean and Sam investigate gruesome attacks in which victims are branded with a strange symbol; Dean meets a woman (Sara Canning) at the town bar.

Ray and Debra try to decide who should care for their children in case anything should happen to them.

Semifinalists are announced.

Dr. Jack Hodgins ("Bones") asks Walter to help find evidence of extraterrestrial activity; Timo and Willa try to deal with their relationship.

Local news.

Jack gains a greater appreciation for leap day; Liz helps Jenna seduce an Internet billionaire; Tracy enlists the writers to help him spend a nearly-expired restaurant gift card.

After realizing everyone forgot Jerry's birthday, Leslie decides to throw him a party; Tom is shocked to learn Ann doesn't share his taste in music.

Dwight and Packer compete for a job; Jim receives an unwelcome visitor; Andy has everyone stay late to cover for their co-workers in Florida.

Chris agrees to throw a joint birthday party for Amy with an enthusiastic neighbor; Ava decides to take the party to the next level; Nancy looks for a man.

Nick investigates a suspected arson case that exposes an enduring family feud; Monroe tries to restrain his wild side.

Alan plans Evelyn's wedding; Charlie pursues his future stepsister.

A CSI team investigates a mysterious death at Charlie's house.

Charlie discovers he is attracted to an older woman who writes self-help books; Jake and Alan fight over a school assignment.

Charlie tries to resist temptation when he meets the daughter of the woman he's dating and realizes they've met before.

Archer must help Gillette save his younger brother from a crooked sheriff in West Virginia.

Gary and Joel's plans to hook up with girls at the school dance are threatened by head lice.

While investigating the assassination of a Navy admiral, the team meets a woman searching for her husband, a political refugee from Africa.

The search for a trained survivalist wanted in connection with a cold-case murder leads the team into the wilderness.

The team believes a Marine is being groomed to become a supersoldier.

Staff Sgt. William James (Jeremy Renner), Sgt. J.T. Sanborn (Anthony Mackie) and Specialist Owen Eldridge (Brian Geraghty) are members of a bomb-disposal unit in Baghdad. As their tour of duty enters its final weeks, the men face a set of increasingly hazardous situations, any of which could end their lives in an explosive instant.

The history of the prominent comedy club All Jokes Aside.

Lip tries to get back into Karen's good graces; Ian ignores Lip; Frank wants to kick Grammy out; Fiona is invited on a boat trip.

Captured by smugglers when he was just a hatchling, a macaw named Blu (Jesse Eisenberg) never learned to fly and lives a happily domesticated life in Minnesota with his human friend, Linda. Blu is thought to be the last of his kind, but when word comes that Jewel (Anne Hathaway), a lone female, lives in Rio de Janeiro, Blu and Linda go to meet her. Animal smugglers kidnap Blu and Jewel, but the birds soon escape and begin a perilous adventure back to freedom -- and Linda.

Freddie pushes for perfection as fight night approaches.

Warwick Davis seeks advice from Ricky Gervais and Stephen Merchant; Liam Neeson pitches himself as a comedic actor.

Robert orders a preemptive strike on the Targaryens; Tyrion helps Catelyn; Sansa is charmed by Ser Loras Tyrell; Arya overhears a plot against her father.