As the ice shrinks in the Arctic, polar bears are struggling to survive in a fast melting world. Although classified a marine mammal, the polar bear is not adapted to hunting in the water. And it is certainly no match for the world's greatest aquatic hunter -- the killer whale. In the last few years, scientists have noted an ever-growing number of killer whales in Arctic waters in the summer months. More and more have been attracted to these hunting grounds by the growing expanse of open water. They attack the same prey as the polar bears: seals, narwhal, belugas and bowhead whales.

A documentarian sets out to make a true-crime murder documentary, but after the movie fails in spectacular fashion, he attempts to save face by doing a director's commentary on the original movie.

Do they really launch themselves onto the shore to grab a hapless snack? See for yourself, and gain a vivid appreciation for their appetites and skills. While your jaw drops at their fearsome agility, you’ll also be learning about their migratory and other behaviours from scientists who observe them daily and strive to increase our understanding of their needs for survival. In this National Geographic ‘Wildlife Special’ you’ll journey around the globe to see their extraordinary hunting techniques in action.

In New Zealand, a scientist, his family and down-on-his-luck investigator are trying to prove that the beaching of the local whale population is caused by activities of a corporation which is searching for natural gas in the area.

The Doctor returns to Gallifrey to become the President of the high council of time lords. But Leela finds the Doctor is acting out of character and she is proved correct, when it is revealed that the Doctor has betrayed his own people and is working for Invisible aliens known as the Vardans who have taken control of the citadel and The Doctor has banished members of the high council and Leela to the wasteland outside the Citadel. But the Doctor has his own agenda, he is planning to thwart the Vardans scheme and time-loop their planet. But what the Doctor doesn't know, is that the Vardans are working for the Sontarans who are the real masterminds and are preparing to invade Gallifrey.

An alien invader crash-lands in a small town and proceeds to terrorize the countryside in this homage to 1950s science fiction and monster movies.

Host Lord Alfred Hayes unearths some exciting matches and rarely seen battles between many of the top Superstars in WWE history, including: Mr. Perfect and Ric Flair facing off in singles action; Bam Bam Bigelow goes one-on-one with Typhoon.

A spectacular, up-close look at the ocean's gentle giants with Dr. Roger Payne.

A spectacular, up-close look at the ocean's gentle giants with Dr. Roger Payne.

A spectacular, up-close look at the ocean's gentle giants with Dr. Roger Payne.