Tonight in HD: August 19

Nikita (TV2, 9.30)

Friends (TV2, 6.30, R) ✫✫✫✫

Rachel gets in trouble for dating her assistant; Monica tries to become friendlier with her neighbours; Phoebe needs lessons in riding a bike.

Shortland Street (TV2. 7.00) ✫✫✫

Sarah finds support; Gabrielle fears for Lana’s future; Evan blows the whistle on Hunter.

New Zealand’s Next Top Model (TV3, 7.30) ✫✫

Continuing with their Abu Dhabi adventure, the five remaining girls try to impress one of the world’s top bookers, then undergo a casting challenge with an Emirates designer.

The Vampire Diaries (TV2, 8.30) ✫✫

When Elena receives disturbing messages from Klaus, Damon and Alaric decide to chaperone Elena to a dance, but Klaus is playing a complicated game.

The Graham Norton Show (TV3, 8.30, R) ✫✫✫✫

With guests Jack Black, John Waters, Miranda Hart and Justin Bieber.

Nikita (TV2, 9.30, F) ✫✫✫

Alex informs Nikita that one of the recruits has been activated to carry out a suicide mission; Nikita intercepts the recruit just as Michael arrives and gunfire is exchanged. (No word on when the season will re-sume but expect it soon-ish in a 10.30 slot.) Reviews: ScreenCrave, IGN,

Unzipped (TV One, 9.45) ✫✫

Sera Lilly tries to control her ‘street cast’ models; the boys from Stolen Girlfriends Club style a ‘look book’; meet the creative force behind Maaike, showing at Fashion Week for the first time.

Supernatural (TV2, 10.30) ✫✫✫✫

Dean and Sam investigate a werewolf killing that turns out to be a skinwalker posing as a family dog who is taking revenge on his owner’s enemies. Reviews: IGN, A Media Mindset.

Poking the Borax (TV3, 11.15) ✫✫

Didio is officially welcomed by Mayor Tim Shadbolt; Titchy’s touching gets out of control in a game of touch rugby; Pammie gets organic at the Levin River Festival.

NCIS (TV3, 11.45, 5.1, R) ✫✫

During the week of Halloween, a murderous psychopath taunts the team by using the Internet to leave clues to the next victim’s identity.

FlashForward (TV2, 12.30, R) ✫✫✫

Olivia tries to get Charlie to reveal her flashforward; Bryce talks to Nicole about his cancer; Demetri, Janis, Simon, and Vogel go to Somalia to investigate the tower Simon created and discover a person who was a part of the ’91 blackout.

CSI: New York (TV3, 12.40, 5.1, R, F) ✫✫✫

The fifth season concludes with kidnappers snatching publishing mogul Robert Dunbrook’s son as he is about to be escorted from prison to court, where he is to testify against his father.