The Office Pearl, 12am This inventive, award-winning British comedy from Ricky Gervais and Steve Merchant made Gervais a household name in Britain for his portrayal of desperate and self-deluding David Brent, a man who sees himself as an entertainer first, and a boss second. Set in a fictional paper merchant, Wernham Hogg, in southern England, the show is filmed as a fly-on-the-wall documentary about modern office life. The first series kicks off with the threat of redundancy hanging over the staff as head office discusses the possible closure of its Slough branch. Far from making cuts, however, Slough regional manager David Brent is showing a new temp around and assuring everyone their jobs are safe. Meanwhile, Gareth (Mackenzie Crook) and Tim (Martin Freeman) are locked in a battle over who should have the stapler. Also starring Lucy Davis (above with, from left to right, Gervais, Freeman and Crook). Smallville World, 9.05pm Clark (Tom Welling) and Lex (Michael Rosenbaum) team up to rescue members of Clark's high school class after a janitor, Earl Jenkins (Tony Todd), takes them hostage in LuthorCorp's Smallville fertiliser plant. Beset by body-rattling jitters, Jenkins claims to have been infected by a mysterious contaminant while working at the plant and he threatens to kill everyone unless he is shown a secret sublevel - which Lionel Luthor (John Glover) denies exists. Also starring Kristin Kreuk (above). Crittercam: Wildtech Adventures - Humpback Whales National Geographic, 8.30pm Dr Fred Sharpe has been studying a unique group of humpback whales in the breathtaking fjords of southeast Alaska for more than 15 years. These remarkable whales have developed an ingenious way of capturing prey: they work together to trap schools of herring in a ring of bubbles, then lunge through this 'bubble net' to gorge on the helpless fish. Sharpe has teamed up with National Geographic's remote imaging team to deploy crittercam - an animal-borne video and data-logging system designed for studying the behaviour of large marine vertebrates - on bubble-net feeding whales. The team hopes to learn more about the hunting tactics and social behaviour of the humpbacks and analysis of the crittercam data and images reveal some astonishing insights.