Winston Churchill understood the power of films, but the true extent of his use of cinema as a propaganda tool is rarely explored. In 1934, one of Britain's most celebrated film producers, Alexander Korda, signed Churchill up as a screenwriter and historical advisor. It was the start of a unique collaboration. Churchill provided script notes for Korda's productions and penned an epic screenplay. When war broke out, their collaboration took on national importance. Korda was sent on a mission to Hollywood to help bring America into the war, with positive results. With access to previously undiscovered documents, this film documentary examines that mission and a friendship that underpinned a unique, creative partnership.

The first major profile of the great British film director Nicolas Roeg, examining his very personal vision of cinema as in such films as Don't Look Now, Performance, Walkabout and The Man Who Fell to Earth. Roeg reflects on his career, which began as a leading cinematographer, and on the themes that have obsessed him, such as our perception of time and the difficulty of human relationships.

This one-hour documentary tells the story of five people that were affected by the Boxing Day tsunami in 2004. They share their personal memories of what it was like for them on that fateful day when almost 230,000 people from more than a dozen countries died. It may be a distant memory for most of us but for thousands of others that date is etched in their minds forever.

New interpretations of the Antikythera Mechanism reveal that it could be used to predict eclipses, and that it had a dial recording the dates of the ancient Olympiads. The 2,000-year-old box of intricate gearwork provides a glimpse of the engineering prowess of the Hellenic world. The team discuss their results here.

Details the German bombing of London the night of the 29th of December, in 1940.

Advanced technology, groundbreaking scientific discoveries about the beginnings of life, and computer animation all combine to detail how multiple siblings develop in the womb as the filmmakers at National Geographic explore the fetal growth of twins, triplets, and quadruplets. Detailed pictures of these different groupings in various stages of fetal development bring the earliest stages of life to the screen as never before.

London, one year from today... The dogs of England are dying, of "Mad Dog Disease," and Rabbie Burns, young drifter and certified schizophrenic, is hearing voices again - on Underground trains, over supermarket tannoys, and on his own T.V. He has 30 hours, a last weekend, to save the world from itself, before the "Supreme Being" himself loses patience and starts over, with a new species...

Profile video of former racer and Formula 1 team owner Ken Tyrrell

Natural World is a nature documentary television series broadcast annually on BBC Two and regarded by the BBC as its flagship natural history brand. It is currently the longest-running series in its genre on British television, with more than 400 episodes broadcast since its inception in 1983. Natural World is produced by the BBC Natural History Unit in Bristol, but individual programmes can be in-house productions, collaborative productions with other broadcasters or films made and distributed by independent production companies and purchased by the BBC. Natural World programmes are often broadcast as PBS Nature episodes in the USA. Since 2008, most Natural World programmes have been shot and broadcast in high definition.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.