The final episode of the series ponders the fate of planet Earth. Neil deGrasse Tyson opens with a reflection on science and those who help us understand it: 'We all feel the weight of the shadows on our future, but in another time, every bit as ominous as our own, there were those who could see a way through the darkness to find a star to steer by.'
The young Carl Sagan and Neil Tyson first discovered their passion for science at the NY World's Fairs of the past. We visit the dazzling Pavilions of the 2039 NY World's Fair, where problems we currently think intractable have been plausibly solved through public commitment and scientific imagination. And our baby is a woman now, with a baby of her own and a future bright with possibilities.

Alejandro Jodorowsky's daring and psychedelic films of the early 1970's, 'El Topo' and 'The Holy Mountain', cemented his status as the Godfather of the Midnight Movie. In 1974, he began work on his next film, possibly the most ambitious film ever attempted. In the pre-Star War era, Jodorowsky’s adaptation of Frank Herbert’s classic sci-fi novel DUNE was poised to change cinema forever. His DUNE would star Brontis Jodorowsky, Alejandro's own 12 year old son, alongside Orson Welles, Mick Jagger, David Carradine and even Salvador Dali. The team of assembled visual artists were some of the most provocative talents of the era, including H.R. Giger, Chris Foss, and Jean ‘Moebius’ Giraud. The groundbreaking special effects were under the control of Dan O'Bannon and the soundtrack would be created by Pink Floyd and the French prog-rock masters, Magma.
For two years, Jodorowsky and his team of 'Spiritual Warriors' worked night and day on the massive task of creating the fabulous world of DUNE. In order to secure the necessary Hollywood funding, they created over 3,000 storyboards, numerous paintings, incredible costumes, and an outrageous, moving, and powerful screenplay. In the words of Jodorowsky’s producer, Michel Seydoux, 'It should have been enough. But it wasn’t.' Through intimate and honest conversations with Jodorowsky, filmed over the span of three years, plus interviews with legends and luminaries including H.R. Giger (artist, ALIEN), Gary Kurtz (producer, STAR WARS) and Nicolas Winding Refn (director, DRIVE and THE NEON DEMON), as well as never-before-seen realizations of Jodorowsky’s mind-blowing psychedelic space opera, director Pavich's film finally unearths the full saga of 'THE GREATEST MOVIE NEVER MADE'.

Is it humankind's greatest achievement? 12 billion miles away a tiny spaceship is leaving our Solar System and entering the void of deep space. It is the first human-made object ever to do so. Slowly dying within its heart is a plutonium generator that will beat for perhaps another decade before the lights on Voyager finally go out. But this little craft will travel on for millions of years, carrying a Golden Record bearing recordings and images of life on Earth. In all likelihood Voyager will outlive humanity and all our creations. It could be the only thing to mark our existence. Perhaps some day an alien will find it and wonder. The story of Voyager is an epic of human achievement, personal drama and almost miraculous success. Launched 16 days apart in Autumn 1977, the twin Voyager space probes have defied all the odds, survived countless near misses and almost 40 years later continue to beam revolutionary information across unimaginable distances.

Located in an almost inaccessible chamber deep in a South African cave, the site required recruiting a special team of experts slender enough to wriggle down a vertical, pitch-dark, seven-inch-wide passage. Most fossil discoveries of human relatives consist of just a handful of bones. But down in this hidden chamber, the team uncovered an unprecedented trove—so far, over 1,500 bones—with the potential to rewrite the story of our origins". They may help fill in a crucial gap in the fossil record and tell us how Homo, the first member of the human family, emerged from ape-like ancestors like the famous Lucy. But how did hundreds of bones end up in the remote chamber? The experts are considering every mind-boggling possibility. Join us on the treacherous descent into this cave of spectacular and enigmatic finds, and discover their startling implications for the saga of what made us human.

Hundreds of years ago in faraway Iceland the Vikings began to write down dozens of stories called sagas - sweeping narratives based on real people and real events. But as Oxford University's Janina Ramirez discovers, these sagas are not just great works of art, they are also priceless historical documents which bring to life the Viking world. Dr Ramirez travels across glaciers and through the lava fields of Iceland to the far north west of the country to find out about one of the most compelling of these stories - the Laxdaela Saga.

Carl Sagan opens the program with a description of the cosmos and the Spaceship of the Imagination. The ship journeys through the universe's hundred billion galaxies, the Local Group, the Andromeda Galaxy, the Milky Way, the Orion Nebula, our Solar System, and finally the planet Earth. Eratosthenes' successful calculation of the circumference of Earth leads to a description of the ancient Library of Alexandria. Finally, the Ages of Science are described, before pulling back to the full span of the Cosmic Calendar.