Casualty: All I Want for Christmas

9.20pm, BBC One

Very few Casualty specials reflect well on the forward-planning abilities of the administrators at Holby City hospital. This one is no exception, as it uses real-life testimonials to help tell stories about blood donors. There’s a shortage on Christmas Day which leads to Iain risking his life in the service of his patients. But there’s lightness too: specifically some cute business involving a homeless dog. Phil Harrison

Katy Perry: Night of a Lifetime

6.30pm, ITV1

It’s fair to say that Katy Perry’s latest album, 143, wasn’t a particular career highlight. That doesn’t mean she can’t still put on a show, though; this one-off sees her taking over Central Hall Westminster for a night of conversation, spectacle and hopefully, mainly back-catalogue bangers. PH

Strictly Come Dancing: 20 Fabulous Years

7pm, BBC One

Two decades have gone by in a flash of sequinned sparkle, but with the help of Tess Daly and Claudia Winkleman, we remember the most moving moments and momentous moves since Brucie’s first foxtrot in 2004. It also revisits hit performances and interviews past contestants. Ellen E Jones

Eurythmics at the BBC

8.25pm, BBC Two

Monster chart hits, presented with an angular art-pop vibe: a themed night of Annie Lennox nostalgia kicks off with a bumper compilation of BBC archive, remembering the imperial phase of Lennox and Dave Stewart collaborating as one of the 1980s’ top pop duos. Jack Seale

Paul Simon: In Restless Dreams

9pm, Sky Documentaries

Alex Gibney’s two-part journey through the life and times of Paul Simon strikes an excellent balance between narrative storytelling and something more intangible: the essence of Simon’s creativity. It covers everything from his middle-class New York roots to the mid-career triumph of Graceland and right up to his most recent album, Seven Psalms. Concludes on Sunday. PH

Meet the Richardsons: Five Years of Laughter

11pm, U&Dave

Here’s a double bill of clips and celebrity fan chit-chat to round out the series – which does feel Christmassy, though possibly not quite as Christmassy as it would’ve been if this now-separated couple had been forced to reunite and fake happy families for the sake of the children or in this case, the TV audience. EEJ

Film choice

ISS, 10.55am, 6.20pm, Sky Cinema Premiere

Best known for investigative documentaries such as Blackfish, Gabriela Cowperthwaite goes into orbit with this speculative sci-fi thriller set on the International Space Station. Scientist Kira (Ariana DeBose) has just arrived to join the six-person crew – half American, half Russian – when nuclear war breaks out (glimpsed ominously through the portholes). Both sides receive orders to take control, but the futility is clear as the Earth burns beneath them. A tense tale with a sharp edge of despair. Simon Wardell

Live sport

Premier League Football: Aston Villa v Man City, 11am, TNT Sports 1 Crystal Palace v Arsenal is at 5pm on Sky Sports Main Event.

World Darts Championship, 2.30pm, Sky Sports Main Event First- and second-round matches in the afternoon session on day seven at Alexandra Palace, London.

Premiership Rugby Union: Leicester Tigers v Bristol Bears, 3pm, TNT Sports 1 Followed by Sale Sharks v Exeter Chiefs at 5.15pm. Saracens v Northampton Saints is on Sunday at 2.30pm.