Imagine a world where dinosaurs still walk the earth. A world where the Germans won World War II and you are president of the United States. Imagine a world where the laws of physics no longer apply and where infinite copies of you are playing out every storyline of your life. 　　It sounds like a plot stolen straight from Hollywood, but far from it. This is the multiverse. 　　Until very recently the whole idea of the multiverse was dismissed as a fantasy, but now this strangest of ideas is at the cutting edge of science. 　　And for a growing number of scientists, the multiverse is the only way we will ever truly make sense of the world we are in. 　　Horizon asks the question: Do multiple universes exist? And if so, which one are we actually in?

宇宙学家敢于大胆地思考不可想象的事物。我们所知道的宇宙其实并不存在。我们只是一个更大的世界——一个无限大的多元宇宙中微乎其微的一部分。在这个一度被认为属于偏激科学家的领域，现在，来自各个物理学领域的证据显示，多元宇宙可能真实存在。在这个具有视觉冲击力的片子中，《地平线》将带你领略四种非常不同的多元宇宙。做好准备，暂时搁置那些关于现实世界的先入为主的观念吧，开放你的思想，去探索一个全新世界的可能性。

Horizon plunges down the biggest rabbit-hole in history in search of the smallest thing in the Universe. 　　It is a journey where things don't just become smaller but also a whole lot weirder. Scientists hope to catch a glimpse of miniature black holes, multiple dimensions and even parallel Universes. As they start to explore this wonderland, where nothing is quite what it seems, they may have to rewrite the fundamental laws of time and space.

Volcanoes have long helped shape the Earth. But what is less well known is that there are volcanoes on other planets and moons that are even more extraordinary than those on our own home planet. 　　Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels between the volcanoes on Earth and those elsewhere in the solar system. Through the team's research, we discover that the largest volcano in the solar system - Olympus Mons on Mars - has been formed in a similar way to those of Iceland, how a small moon of Jupiter - Io - has the most violent eruptions anywhere, and that a moon of Saturn called Enceladus erupts icy geysers from a hidden ocean. Computer graphics combined with original Nasa material reveal the spectacular sights of these amazing volcanoes. 　　Along the way, we learn that volcanoes are not just a destructive force but have been essential to the formation of atmospheres and even life. And through these volcanoes of the solar system, scientists have discovered far more about our own planet - what it was like when Earth first formed, and even what will happen to it in the future.

本部纪录片是BBC地平线系列推出的一档探寻“土星的秘密”为命题的纪录片。土星，这颗人类用肉眼能够看到的最远行星，以其神秘美丽的土星环而被赋予诸多神话色彩。为了能够近距离地研究土星，美国国家航空航天局于1997年10月15日发射了“卡西尼-惠根斯”探测器。这将是关于航天史上最为野心勃勃的一次无人驾驶航天飞船项目，土星之谜即将被揭开。 　　土星拥有为数众多的卫星，而最著名的“土卫六”上有大气一说，更是最受天文学家瞩目的课题，也是本部纪录片的高潮所在。千百年来，人类都在试图揭开生命起源之谜。那么我们就跟随地平线摄制组的脚步，一起踏上这个跨越太阳系的伟大征程。通过探测这个未知的外星世界，来解答生命是如何开始的提问。

Dr Kevin Fong tackles moral questions surrounding death that face not just the medical profession, but each and every one of us. Throughout the programme, he meets medical professionals who are at the heart of the dilemmas surrounding our attempts to defeat death and live as long as possible, as well as people who are facing up to the question of how to die a better death.

Corby镇出现多名天生四肢畸形缺陷的新生儿，调查发现可能与当地污染废料有关。

Dr Alice Roberts asks one of the great questions about our species: are we still evolving? 　　There's no doubt that we're a product of millions of years of evolution. 　　But thanks to modern technology and medicine, did we escape Darwin's law of the survival of the fittest? 　　Alice follows a trail of clues from ancient human bones to studies of remarkable people living in the most inhospitable parts of the planet and the frontiers of genetic research, to discover if we are still evolving - and where we might be heading.

在英国，自杀是50岁以下男性的主要死因。这部敏感的纪录片分析了关于自杀的性别悖论，提出了一些被禁止太久的问题。《地平线》摄制组将前往酒吧、俱乐部、国际男性杂志的总部，想办法挽救数千人的生命。纪录片通过私密的第一手资料，讲述那些在希望的边缘活下来的人的故事。