Horizon Season 57 Episode release dates & where to watch

1. Addicted to Painkillers? Britain's Opioid Crisis

Dr Michael Mosley immerses himself on the frontline of our prescription painkiller habit. In America, it is an epidemic. Now, new evidence raises concern about the UK's use of prescription opioids.

2. Chris Packham: 7.7 Billion People And Counting

Naturalist Chris Packham investigates the impact a growing human population is having on the planet, asking whether the earth can sustain predictions of ten billion people by 2050.

3. Toxic Town: The Corby Poisonings

The unknown story of the worst child-poisoning case since thalidomide, featuring a landmark legal battle by a group of mothers determined to uncover the truth.

4. The Restaurant that Burns Off Calories

Fred Sirieix and Zoe Williams open a restaurant with a difference, where every calorie eaten must be burned off by a secret gym team.

5. Hubble: The Wonders of Space Revealed

To celebrate the 30th anniversary of its launch, this film tells the remarkable story of how Hubble revealed the awe and wonder of our universe and how a team of daring astronauts risked their lives to keep it working.

6. The Great British Intelligence Test

Dr Hannah Fry and Michael Mosley put the public to the test, pitting young and old, males and females and tech lovers and readers against each other in a battle of wits.

7. What's the Matter with Tony Slattery

Comedian Tony Slattery meets experts to explore his psychological problems, finding out if he is definitely bipolar, confronting addiction and opening up about a childhood trauma.

8. Pluto: Back From the Dead Finale

The incredible story of how Pluto has been propelled from an unremarkable ball of ice on the edge of the solar system to a world of unimaginable complexity - where some form of alien life might exist.