Everyone has an opinion on bad cars. Now it's time to hear the ones that really count - ours. We're out to name and shame the most rubbish car from a manufacturer which, frankly, should have known better. And we have a special, surprise fate in store for the car we pick as our biggest loser. In this Top Gear special episode, Jeremy Clarkson and James May try to look for the worst car of all time and the criteria was that the car had to be 'terrible, but not cheap' and made by 'a manufacturer that should have known better'.

Fly across iridescent tropical reefs, brush through a cloud of a million jellyfish, visit an alien world where the closer you look, the more you see, where the tiniest creatures support the greatest predators... We think of reefs as exotic, distant places with little or no connection to our everyday world. Yet every reef is a living city beneath the sea with a parallel existence to ours, distant yet undeniably connected. Reefs are hotspots of biodiversity as vital to life on earth as the rain-forests. They have been shaping our shorelines, literally forming islands and mountains, for millions of years. The fossil record shows that given time they have recovered from all of earth's major extinction events. Even reefs pulverised by atomic blasts at Bikini Atoll have regenerated. Yet within our lifetime reefs have come to face their greatest threat...

'Every show is different. When the lights go down that's 30,000 people's lives colliding... for that one moment. Everyone that's there working or watching is there for that moment. It's when you're all kind of in agreement about what you're all doing at that time... so it's a wonderful feeling of togetherness and possibility Then I start getting real adrenaline... and start doing 'Rocky' shadow boxing and all that kind of stuff.
So I get as excited as anyone else. And I still get that excitement when I go and see anyone else's concert. I love that moment. And then it's about trying to hold that energy for an hour and a half... because it can go if you're not careful Whilst it might not be perceived as cool to be really enthused by the fact that people show up to hear your music... we don't really give a f***, we really love that and it's exciting, you know?'

The filmmakers challenge former Indonesian death-squad leaders to reenact their mass-killings in whichever cinematic genres they wish, including classic Hollywood crime scenarios and lavish musical numbers. Anwar Congo and his friends have been dancing their way through musical numbers, twisting arms in film noir gangster scenes, and galloping across prairies as yodeling cowboys. Their foray into filmmaking is being celebrated in the media and debated on television, even though Anwar Congo and his friends are mass murderers.
Medan, Indonesia. When the government of Indonesia was overthrown by the military in 1965, Anwar and his friends were promoted from small-time gangsters who sold movie theatre tickets on the black market to death squad leaders. They helped the army kill more than one million alleged communists, ethnic Chinese, and intellectuals in less than a year. As the executioner for the most notorious death squad in his city, Anwar himself killed hundreds of people with his own hands.
The Act of Killing is about killers who have won, and the sort of society they have built. Unlike ageing Nazis or Rwandan génocidaires, Anwar and his friends have not been forced by history to admit they participated in crimes against humanity. Instead, they have written their own triumphant history, becoming role models for millions of young paramilitaries. The Act of Killing is a journey into the memories and imaginations of the perpetrators, offering insight into the minds of mass killers. And The Act of Killing is a nightmarish vision of a frighteningly banal culture of impunity in which killers can joke about crimes against humanity on television chat shows, and celebrate moral disaster with the ease and grace of a soft shoe dance number.

It's a voyage of exploration like no other - to Titan, Saturn's largest moon and thought to resemble our own early Earth. For a small team of British scientists this would be the culmination of a lifetime's endeavour - the flight alone, some 2 billion miles, would take a full seven years. This is the story of the space probe they built, the sacrifices they made and their hopes for the landing. Would their ambitions survive the descent into the unknown on Titan's surface?

Einstein's world-shaking Theory of Relativity says that time travel is perfectly possible -- if you're going forward in time. Finding a way to travel backwards requires breaking the speed of light, which so far seems impossible. But now, strange-but-true phenomena such as quantum nonlocality (where particles instantly teleport across vast distances) may give us a way to make the dream of traveling back and forth through time a reality. Step into a time machine and rewrite history, bring loved ones back to life, control our destinies. But if succeed, what are the consequences of such freedom? Will we get trapped in a plethora of paradoxes and multiple universes that will destroy the fabric of the universe?