When a kid discovers a weapon that someone was killed with, the entire family ends up under investigation, as the NCIS team has to find out who was the last one that used the weapon and who got shot with it.

The third results show also has a performance by singer Adele and the duo Hall & Oates.

All of the contestants head home for a week, where they are faced with the challenge of continuing to make healthy food choices and getting their workouts done in their home environments. After they arrive home, each player gets a DVD with host Allison Sweeney revealing their "at home challenge" to run a half marathon 13.1 miles! A cookie temptation adds an interesting twist to the competition, and the players find out the results of their hard work once they return to the ranch. Later, another contestant is sent packing.

The stray mutt which Ben and Melissa found a week ago still has no name, despite all their efforts. If Carbo has his way, the dog may not be around long enough to need a name. After barking all day and night and chewing his mum's shoes, Carbo delivers an ultimatum to his housemates - find the dog's owner or it's off to the pound.

In collaboration with National Geographic, NOVA follows the exploits of acclaimed photojournalist James Balog and a scientific team as they deploy time-lapse cameras in risky, remote locations in the Alps and Arctic, including Alaska and Greenland. Grappling with blizzards, fickle technology, and climbs up craggy precipices, the team must anchor cameras capable of withstanding subzero temperatures and winds up to 170 miles per hour. In this high-action scientific adventure, NOVA and National Geographic investigate the mystery of the mighty ice sheets, whose still-unknown behavior will affect the fate of coastlines around the world.

The Devil takes Sam to the police station and introduces him to Morgan, whom he calls his son. Now, Sam and the gang are tasked with hanging out with Morgan and showing him the ropes.

The CBI is called to investigate when the personnel director of Carnelian, Inc. plummets to his death at Jane's feet during a skydiving exercise.

A little boy named Alwyn Jones comes to the precinct to tell the constables that he witnessed a crime. Inspector Murdoch decides to indulge him by accompanying him where the crime happened. Alwyn swears he saw a giant knight and heard a gun being discharged but Murdoch sees nothing. He brings the boy back home and makes the acquaintance of his mother, Enid. Murdoch must investigate the murder of Ezra Dolomore, a scientist. When Terrence Meyers is spotted near the body, Murdoch believes there is more than meets the eye.

One night Toby meets in a bar a beautiful pathologist named Mina that the following day turns out to be dead. Toby is initially considered to be a suspect of the crime, but everything takes an unexpected twist as it seems that Mina might have discovered a conspiracy inside the office of the judge that leads the case.

Grace's uncle pays a visit and ends up causing problems for Kim. Things heat up between Rachel and Eddie.

Kelly and Masoko Neville are revisited by Kevin whose dream it was to build a hexagonal straw-baled house.

The sixteen new candidates meet Sir Alan for the first time and receive their challenge. They have to start cleaning companies and make as much money as possible. At the end of the show the first of the hoepfuls is fired.

Charlie Brooker looks at the news's obsession with the credit crunch, and the potty levels it has reached. Nick Davies authors a piece about the influence the PR industry has over the news and Tim Key performs a poem.