The black hole at the centre of the Milky Way is getting ready to feast. 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. For cosmic detectives across the Earth, it is a unique opportunity. For the first time in the history of science, they hope to observe in action the awesome spectacle of a feeding supermassive black hole.

This episode explores the wave theory of light as studied by mankind, noting that light has played an important role in scientific progress, with such early experiments from over 2000 years ago involving the camera obscura by the Chinese philosopher Mozi. Tyson describes the work of the 11th century Arabic scientist Ibn al-Haytham, considered to be one of the first to postulate on the nature of light and optics leading to the concept of the telescope, as well as one of the first researchers to use the scientific method. Tyson proceeds to discuss the nature of light as discovered by mankind. Work by Isaac Newton using diffraction through prisms demonstrated that light was composed of the visible spectrum, while findings of William Herschel in the 19th century showed that light also consisted of infrared rays. Joseph von Fraunhofer would later come to discover that by magnifying the spectrum of visible light, gaps in the spectrum would be observed. These Fraunhofer lines would later be determined to be caused by the absorption of light by electrons in moving between atomic orbitals when it passed through atoms, with each atom having a characteristic signature due to the quantum nature of these orbitals. This since has led to the core of astronomical spectroscopy, allowing astronomers to make observations about the composition of stars, planets, and other stellar features through the spectral lines, as well as observing the motion and expansion of the universe, and the existence of dark matter.

Corey Feldman (star of Friday the 13th: The Final Chapter) narrates Crystal Lake Memories, which features interviews with approximately 150 cast and crew members from all twelve Friday the 13th films and the syndicated television series, many of whom have never before appeared in on-camera interviews. Interview subjects include Kane Hodder, Robert Englund, Tom Savini, Danielle Panabaker, Sean S. Cunningham, Derek Mears, Betsy Palmer, Wes Craven, Robert Shaye, Alice Cooper and many more

Of all the wonders of the human body, there's one more mysterious than any other. Blood: five precious litres that keep us alive. Yet how much do we really know about this sticky red substance and its mysterious, life-giving force? Michael Mosley gives up a fifth of his own blood to perform six bold experiments". From starving it of oxygen to injecting it with snake venom, Michael reveals the extraordinary abilities of blood to adapt and keep us alive. Using specialist photography, the programme reveals the beauty in a single drop. Michael even discovers how it tastes when, in a television first, he prepares a black pudding with his own blood. Down the ages, our understanding of blood has been as much myth as science, but Michael reveals there might be truth in the old vampire legends, as he meets one of the scientists behind the latest research that shows young blood might be able to reverse the ageing process - the holy grail of modern medicine.

When the Second World War ended, the people of liberated Europe celebrated their freedom from Nazi tyranny. Their years of suffering had ended, but for millions of Germans, the end of the conflict opened a new and terrible chapter. They suffered the appalling violence meted out to the defeated, especially to those ethnic Germans who had lived peacefully for centuries in neighbouring countries". Savage Peace uses rare and unseen archive film, the documentary tells a harrowing story of vengeance against German civilians, which mirrored some of the worst cruelty of the Nazi occupiers during the years of war. The Savage Peace includes the unique testimony of eyewitnesses and victims, who recall the horrors with searing clarity, their memories undimmed 70 years after the events took place. This a story that has, until now, been untold amidst the justified celebration of an end to an unspeakable tyranny. But as the writer George Orwell said, the treatment of the defeated Germans was a terrible crime that has gone unpunished.

Written and presented by Robert Hughes, one of the world’s most prominent art commentators, this program explores the life and work of Francisco Goya—focusing on the painter’s subversive, often gruesome outlook. The video provides in-depth visual and intellectual analysis of dark Goya masterpieces, including The Dream of Reason, Witches in the Air, and The Third of May, as well as examples of his portraiture and early work—such as The Duchess of Alba, both Majas, and a gratuitously violent tapestry painting. Links between Goya’s work, deafness, and political stance are explored in detail, while observations from painter Leon Golub highlight Goya’s continuing relevance.