Channel 4's annual charity event returns with a troupe of performers large enough to make the Polyphonic Spree look on in envy. As ever, it's a mix of the established and the incipient, so Jo Brand and Jonathan Ross line up alongside men of the moment Adam Hills and Josh Widdicombe. Elsewhere, comedians dancing seems to be a thing just now, so Miranda Hart and Warwick Davis duly join up with Diversity to show off their moves, while Russell Brand absents himself from Hollywood to partake in some audience interaction.

Dance sensation Diversity puts a spring in the steps of Chatty Man Alan Carr, national charmer Miranda Hart and Idiot Abroad Warwick Davis, who've rashly decided to shake a leg - Ashley Banjo-style - as their contribution to this evening of fundraising action for Great Ormond Street Hospital Charity for children. Other funny faces putting their happy feet forward for the cause include comedian Kevin Bridges, who takes a pop at the more furtive pursuits of his fellow Scots, and TV regulars Russell Brand, Jack Dee, Jo Brand, Rich Hall and Paddy McGuinness. Among those putting in an appearance on VT are surreal loon Noel Fielding and Jack Whitehall.

Would I Lie To You? is a BBC One panel show originally hosted by Angus Deayton and now hosted by Rob Brydon. The point of the show is to lie to or fool your opposing team into believing what you are telling them is the truth. Successfully deceive your opposition and get some points. Simple, yet affective. Joining Rob Brydon as regular Team Captains are the wonderful David Mitchel and Lee Mack. Guests on this episode are Jason Manford, Paul Hollywood, Warwick Davis and Joan Bakewell.

This, as a celebrity panel show, couldn't really be much different from a show like Celebrity Juice if it tried; WILTY is about quick thinking and wit. 5 minutes in and I haven't heard a single muff joke. It's a great show and one I don't watch as much as I probably should. It is entertaining, likeable and unique. The players are all pitch perfect; great chemistry and natural comedians. There is lots of great comedy which manifests itself organically within the show.

Sadly, it looks as though there will be no second series of Life's Too Short, but my favourite comedy of 2011 enjoyed a last hurrah, thanks to a one-hour special that addressed many of the faults, and played to the strengths, of its first run.

Gone were the gratuitous physical humiliations visited upon star Warwick Davis, along with the David Brent mannerisms bequeathed him by writers Ricky Gervais and Stephen Merchant.

Instead, Davis was given free rein to explore the comic potential of his complex, conflicted and constantly embattled character. Rosamund Hanson provided scene-stealing support as dippy secretary Cheryl.

Extra helpings of guest stars playing either unflattering or unsympathetic versions of themselves were also served up. Shaun Williamson, Keith Chegwin and Les Dennis all made a welcome return - "Three Z-list celebrities make one D-list celebrity," encouraged Davis as they embarked on their All Star roadshow - with a surprise appearance from the former Hollywood star and one-time screen Batman Val Kilmer.

With an enthusiasm that bordered upon self-flagellation, Kilmer portrayed himself as a slightly deranged fantasist and maniacal con man who raises, and then shatters, Warwick's dreams of a sequel to Willow.

Painfully poignant, beautifully played and constantly inventive, this one-hour special conclusively proved that Life's Too Short's own end was also premature.

It may not be fashionable to approve of anything with Ricky Gervais's name on it. But this Life's Too Short Special (BBC2, Saturday) - with Val Kilmer, along with Les Dennis, Keith Chegwin, and Shaun Williamson joining Warwick Davis - is a piece of genius. There's nothing Gervais hasn't done before. An obsession with disability: check. Fading slebs making tits of themselves to highlight the horrors of the fame game: check. More squirminess than a sack of snakes with the squits: check. But it's done with such a breathtaking boldness that it's impossible not to gasp with a mixture of shock'n'awe. I mean he gets Chegwin to revisit not just his drunkenness but his nakedness too!

Actually the funniest moment is when Les, Keith and Shaun are sharing a hotel bed, to save money. "Not while I'm reading [Sartre as it happens]," says Shaun, when Cheggers reaches down to say hello to little Cheggers, if you know what I'm saying.

Then Gervais chucks in the curveball of touchingness (the other sort). It shouldn't be surprising - he usually does - but it somehow catches you off-guard. Especially poignant if you've just watched Kavana on The Voice.

Things look promising for Warwick Davis in this hour-long Easter special when Val Kilmer, his co-star in 1980s fantasy Willow, turns up in London to tout a possible sequel. But the main action involves our diminutive hero's attempt to resurrect the careers of Les Dennis, Keith Chegwin and Shaun Williamson ("Barry from EastEnders") via a low-rent pub roadshow. It's a cruel extended riff on the backwoods of fame and occasionally the horrible edginess of it is very funny.

"I used to be a lying, conniving, selfish little shit." Yes you did, Warwick Davis. But for the purposes of this one-off valedictory special, that won't do. Because if no one cared, that would prevent Ricky Gervais and Stephen Merchant from tacking on another of their increasingly trite redemptive endings. But is anyone really that bothered about Life's Too Short anyway? Surely not like they were about Extras - and certainly not like they were about The Office.

As we rejoin Warwick, he's 'a changed man'. He's kind, conscientious and generally rather likeable. So when this concluding cavalcade of horrors - which includes a mendacious Val Kilmer, the further self-abasements of Les Dennis and Keith Chegwin and yet more smug, sideline rubbernecking from the show's creators - dumps Warwick in the mire, we're supposed to feel his pain. Sadly, this particular group hug hasn't been earned, so the conclusion feels as hollow and joyless as the rest of the series.

Gervais & Merchant's dismal sitcom Life's Too Short returns unbidden for a one-off finale. Drab and mean-spirited, it sidelines its nominal star, Warwick Davis, in favour of the supposedly hilarious spectacle of ha-ha-has-beens Keith Chegwin, Shaun Williamson and Les Dennis making fools of themselves. It's truly desperate stuff.

Norton foregoes the usual physical challenges beloved of Comic Relief for a more sedentary affair: attempting to set the Guinness world record for most questions asked on a TV chat show, which should see him broadcasting into the wee hours of Friday morning. We can only hope that Graham also dispenses with his usual tipple of wine with guests, otherwise this chatathon is going to get very messy.

So far guests announced as appearing on the sofa include Ronnie Corbett, RT's Sarah Millican, Martin Freeman, Elle Macpherson, James Nesbitt, Louis Smith, Heston Blumenthal, Warwick Davis, Russell Tovey and Jimmy Carr, though you wouldn't bet against an American superstar or two turning up, too. Music acts will include Example, Paloma Faith, Hurts and Laura Mvula.

Graham will be assisted by co-hosts Terry Wogan, Frank Skinner and Nick Grimshaw, and viewers can help, too, by submitting questions via Twitter and Facebook. And by donating money.

Val Kilmer to guest star in final Life's Too Short

Hollywood actor Val Kilmer will appear in a one-off special of TV comedy Life's Too Short nearly 25 years after he and Warwick Davis last worked together.