Tonight's line-up has the potential for all kinds of off-kilter brilliance - Hollywood star Jake Gyllenhaal, caustic comic Joan Rivers and Top Gear's Jeremy Clarkson and James May. Makes you almost feel sorry for Gyllenhaal, a serious actor, surrounded by that lot. His sister Maggie was a Norton guest two years ago and looked terrified.

He's here to talk about his latest film, the police thriller End of Watch. Rivers will be triumphant after a sell-out British tour, while Clarkson and May have a Top Gear DVD to plug.

New Zealanders keep confusing Stephen Fry for James May

Stephen Fry is hoping a haircut will stop Kiwis mistaking him for Top Gear presenter James May.

This could possibly be the most deranged variety show you'll ever see, the only place on earth where you can watch Christopher Biggins pretending to be Boris Johnson, and Jerry Hall impersonating Katie Price. If that doesn't draw you in, how about Joe Pasquale as Lady Ga-Ga? Or Ulrika Jonsson as David Beckham? No? Surely Vanessa Feltz masquerading as James May is irresistible. As is Eamonn Holmes as Elvis Presley. And David Gest as Elton John. Les Dennis as Gary Barlow... The list goes on, and just gets odder. The All Star Impressions Show could be completely awful or it could be enjoyably barmy. It certainly has a very good pedigree, being co-produced by Steve Coogan's and Vic Reeves and Bob Mortimer's production companies. And it has a certain surreal gloss that could be quite winning. Harry Hill will make a guest appearance, though we don't know whether he will reprise the Morrissey impression that won him Celebrity Stars in Their Eyes all those years ago.