In a once-in-a-lifetime performance, some of the greatest stars ever seen on stage come together to celebrate the 50th anniversary of the National Theatre.

This episode sees Stephen visit Brazil, home to the largest gay pride celebration in the world and a place that has some of the best legislation on the planet for gay equality.

In the first of this two-part series, Stephen Fry reflects back on just how much has changed for gay people during his lifetime.

Professor Jim Al-Khalili tells the story of how we went from thinking we were close to a complete understanding of the universe to realising we had seen almost none of it. Today, our best estimate is that more than 99 per cent of the cosmos is hidden in the dark, invisible to our telescopes and beyond our comprehension.

Two-part series in which Professor Jim Al-Khalili shows how, by uncovering its secrets, scientists have used light to reveal almost everything we know about the universe.

The team behind the Nobel Peace Prize-nominated Sri Lanka's Killing Fields tell the story of the 138-day-long final offensive in Sri Lanka's bloody civil war

Drawing on the latest theories as well as 200 years of scientific discoveries and the genius of Einstein, Brian tries to answer the classic questions raised by the Doctor - can you really travel in time? Does extra-terrestrial life exist in our galaxy? And how do you build something as fantastical as the TARDIS?

David Attenborough embarks on an epic 500-million-year journey to unravel the incredible rise of the vertebrates. The evolution of animals with backbones is one of the greatest stories in natural history.

How mammals developed from tiny forest dwellers to the dominant life form on the planet.

It's a macabre paradox, but almost every advance in aviation safety has been driven by a crash. After every crash, investigators determine its cause and scientists make every effort to ensure the same mistakes never happen again.

Fracking has become a national debate in Britain and it’s one the Government are determined to win. With an estimated 1,300 trillion cubic feet of shale gas lying underneath Britain, just a tenth of which could supply our energy needs for over 40 years, it is seen by many as an opportunity which is too good to miss.But what is the environmental cost?

Professor Alice Roberts is making a new human being - she is pregnant with her second child. But before he is born, she wants to find out what makes a human, human? What is that separates us from our closest living relatives - the chimpanzees?

Liz Bonnin delves in to the world of invention, revealing the people and technologies set to transform all our lives. She examines the conditions that are promising to make the 21st century a golden age of innovation and meets some of the world's foremost visionaries, mavericks and dreamers.

Taste is our most indulgent sense but it is only in recent years that we have started to understand why we really love the foods we do - and it is a lot more surprising than you might think.

Michael Mosley explores the latest science about how our personalities are created - and whether they can be changed.

Horizon meets the people at the forefront of the data revolution, and reveals the possibilities and the promise of the age of big data.

A gas cloud three times the size of our planet has strayed within the gravitational reach of our nearest supermassive black hole. And across the globe, telescopes are being trained on the heart of our Milky Way galaxy, some 27,000 light years from Earth, in the expectation of observing this unique cosmic spectacle.

Dr Kevin Fong explores a medical revolution that promises to help us live longer, healthier lives. Inspired by the boom in health-related apps and gadgets, it's all about novel ways we can monitor ourselves around the clock. How we exercise, how we sleep, even how we sit.

Transplant surgery has now reached incredible heights, from achieving full face transplants to growing organs in the lab. This Horizon Guide looks back at the extraordinary odds doctors and patients have had to overcome to achieve these amazing breakthroughs.

Sex is a simple word for a very complex set of desires. It cuts to the core of our passions, our wants, our emotions. But when it goes wrong, it can be the most painful thing of all. Professor Alice Roberts looks through 45 years of Horizon archive to see how science came to understand sex, strived to solve our problems with it, and even help us to do it better. Can science save the day when sex goes wrong?

The hunt for life within the long-dead bones of dinosaurs may sound like the stuff of Hollywood fantasy - but one woman has found traces of life within the fossilised bones of a T Rex.

Exploring the murky and fast-paced world of the hackers out to steal money and identities and wreak havoc with people's online lives, and the scientists who are joining forces to help defeat them.

Documentary looking at justice in the land inhabited by Palestinians and captured by Israel in the 1967 war. The occupation began with the idea that Israel's presence would be temporary. Israelis dispensed justice through military courts, but these still exist.

Werner Herzog's feature-length documentary exploring a triple killing in the United States focuses on the fates of the two men convicted of the murders: Michael Perry and Jason Burkett.

A powerful documentary portrait of legendary British war photographer and photojournalist Don McCullin. Told through a series of searingly honest and often graphic interviews, McCullin recounts a life lived in the theatre of war.

Documentary telling the remarkable life story of Senegal's most renowned singer/composer, Youssou N'Dour. He found international fame with the song 7 Seconds, but he became the voice of Africa through the emotional power of his songs followed by a dangerous move into politics.

Classicist Dr Michael Scott uncovers the strange, alien world of the ancient Greeks, exploring the lives of the people who gave us democracy, architecture, philosophy, language, literature and sport.

Classicist Dr Michael Scott, explores the legacies of the Ancient Greeks, what they have given us today, and asks why these legacies have lasted through time.

Documentary telling the story of the British world music revolution from the early 1980s to the present. Through a variety of careers, starting with Zimbabwe's Bhundu Boys and culminating with Portugal's Mariza in the new millennium, the film explores what it takes to bring music from 'out there' over here.

Manchester's International Festival is a collection of world class talent, theatrical premieres, ground breaking musical performances and global stars from the contemporary art scene. Amongst these gems will be Shelley's The Masque of Anarchy, performed by Maxine Peake, one of the most gifted actors of her generation.