- 06:15David Attenborough's Natural CuriositiesSeries 1 Shorts: 1. Stretched to the Limit
Sir David investigates creatures that have made the ordinary extraordinary.
- 06:40Naomi's Nightmares of NatureSeries 1: 6. Australia: Desert
Naomi discovers the darker side of Australia's largest kangaroo.
- 07:10The Pets FactorSeries 2: 1. Ziggy, Ruskin and Tops
James gets a visit from Ziggy, a very noisy lurcher with a poorly tail.
- 07:30The DengineersSeries 2: 11. Highlights Den
The team look back at all the amazing dens built throughout the series.
- 08:00Absolute Genius: Monster Builds6. Under Attack
Dick and Dom are under attack in this high-octane tour through defensive engineering.
- 08:30Beyond BionicSeries 1: 6. Hummingbird
Andy Torbet attempts to match the amazing hovering skills of the hummingbird.
- 09:00Robot WarsSeries 10: Episode 1
The teams are Donald Thump, Behemoth, Sabretooth, Apollo, Apocalypse and The Swarm.
- 10:00Snooker: World Championship2018: Day 1, Morning Session
Mark Selby begins the defence of the title as the snooker season's climax gets underway.
- 12:00Wanted Down UnderSeries 9 30-Minute Reversions: Episode 2
British families look at life in Australia or New Zealand ahead of a possible move there.
- 12:30Trust Me, I'm a DoctorSeries 6: Episode 3
Michael Mosley and Dr Chris van Tulleken investigate omega-3 supplements.
- 13:30Britain's Biggest WarshipSeries 1: 1. Crewing Up
How the crew of HMS Queen Elizabeth breathe life into Britain's biggest warship.
- 14:30Top of the Shop with Tom KerridgeSeries 1: Episode 1
Four makers of preserves, pickles and spreads battle it out for one place in the final.
- 15:30Top of the Shop with Tom KerridgeSeries 1: Episode 2
This time it is cheesemakers competing against each other for a place in the final.
- 16:30Final Score21/04/2018
All the day's football results, including Watford v Crystal Palace and Bolton v Wolves.
- 17:15Money for NothingSeries 3: Episode 1
Sarah Moore rescues a granite worktop, a scientific microscope and some wire mesh.
- 18:00Antiques Road TripSeries 15 Reversions: 5. Charles H & Natasha RS - Days 4 & 5
Natasha Raskin Sharp hopes for a big hit with a Sergeant Pepper style military jacket.
- 19:00Snooker: World Championship2018: Day 1, Evening Session
Defending champion Mark Selby hopes to secure his place in the second round.
- 20:00The ForestSeries 1: Episode 2
The Cree Hatchery and Habitat Trust attempt to restock salmon in the river.
- 20:30Dad's ArmySeries 6: 7. The Recruit
While Captain Mainwaring is in hospital, Sergeant Wilson lets the vicar join the platoon.
- 21:00imagine...Winter 2017/18: 7. Habaneros: You Say You Want a Revolution? Part One
Film capturing the mood of Havana and its people, the Habaneros, at a pivotal moment.
- 22:05Testament of Youth
Vera Brittain's plans change with the declaration of the First World War.
- 00:05Snooker: World Championship Highlights2018: Day 1
Highlights from Saturday evening's matches, as defending champion Mark Selby competes.
- 00:55World Championship Snooker Extra2018: Day 1
Highlights of the opening day's play from the Crucible Theatre in Sheffield.
- 02:55CivilisationsSeries 1: 8. The Cult of Progress
David Olusoga explores the artistic reaction to imperialism in the 19th century.