Jack Whitehall joins David this week and together they'll take on a variety of comedy guises as you've never seen them before.
We'll get their inappropriate take on Sherlock and Watson, the world's worst dating show contestant, and Jack dressing as a women, even though that's usually David's style!
There's also the launch of Britain's cruelest reality TV show, Celebrity Slammer, where David's locked in with the Chuckle Brothers and Bob Carolgees.
Walliams and Friend, BBC1, 9.30pm
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