Saturday
Let's Dance For Comic Relief
7.15pm. BBC1
Yes, the Dirty Dancing duo did an admirable job, but they mustn't beat Robert "Peep Show" Webb's eye-popping routine from Flashdance. No comedy sidekick, no safety net, no backing dancers. Just him and the rhythm. He really is dancing like no one is watching. But we all will be.
The Lost World of Communism
9pm, BBC2
Twenty years since the fall of the Berlin wall, film-maker Peter Molloy draws back the iron curtain to find out what Soviet life was really like.
Hidden Japan
Starts 11.30pm, BBC4
This series explores the art and soul of Japan, with films including Spirited Away, Gohatto and Twilight Samurai and documentaries on everything from samurais to fish and the meaning of "wabi sabi".
Sunday
Yellowstone
8pm, BBC2
A three-episode tour of America's Eden, a place of plains, forests mountains and great buffalo herds.
Talladega Nights: The Ballad Of Ricky Bobby
8.15pm, Five
More enjoyably goofy sports comedy nonsense with Will Ferrell. This time he's a Nascar driver – but it's Sacha Baron Cohen's OTT French rival who races off with the film.
The No 1 Ladies' Detective Agency
9pm, BBC1
Jill Scott resumes her role as Mma "Precious" Ramotswe – Botswana's premier female sleuth – for a full series of films based on the Alexander McCall Smith novels.
