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.

Famed astrophysicist Neil deGrasse Tyson takes a tour of the Solar System and the known universe establishing the components of Earth's "address" within the Virgo Supercluster. He then shares the story of the person who championed an expansive understanding of Earth's place in the universe by presenting Renaissance Italian Giordano Bruno's vision of the universe as a limitless expanse of space and time. He then makes an exploration into the Cosmic Calendar, which dates back to the dawn of the Big Bang (similar to the presentation from episode 1 of the original series). The episode ends with deGrasse Tyson narrating how he met his mentor Carl Sagan, who hosted the first Cosmos series.

The results of the TB test are in... but just as important is the fact that numerous calves are scheduled to be born in the next couple of weeks. The first few happen very quickly in the dead of night before Jeremy's woken up, but soon he and Kaleb are dealing with some very challenging situations. Jeremy also meets local farmers to discuss a farmers' co-operative to supply the restaurant - much-needed by some who are really struggling - because the clock is counting down to Decision Day, when the Council will hold a public meeting to decide the fate of Jeremy's restaurant.
After weeks of waiting, the day of judgement for Clarkson's restaurant is at last here. He and Charlie set off to put their case to the powers that be. Is it a Yes? Or is it a No?

Everyone's still reeling from the council's decision and its implications: the money Jeremy's spent on cows for the restaurant, the locals who won't find work there now and the farmers' co-operative that's now defunct. Charlie sets out to find a legal team to help Jeremy appeal the decision, as Jeremy and Kaleb get to work on tagging the new calves and attempting to navigate a government helpline where you're supposed to register them.
There are other useful distractions from the council in the shape of Diddly Squat's Hedge Laying Competition and a mouse that brings the whole farm to a standstill. The legal team that Charlie has assembled pay a visit. They outline their strategy for the appeal, but also the costs that come with it.

November 4, 2029. We face a countdown to catastrophe. A giant asteroid hurtles towards Earth at 40,000 mph. It's heading straight for the eastern seaboard of the United States. The space rock could wipe out an entire city and cause widespread devastation. Can Earth survive? Now, experts confront the story of this fictional asteroid event to determine what could happen, and how it might be stopped.

A stunning documentary about the escalating global nuclear arms crisis, Countdown to Zero is a fascinating and frightening exploration of the dangers of nuclear weapons, exposing a variety of present day threats and featuring insights from a host of international statesmen and experts. Among the voices are President Jimmy Carter, Mikhail Gorbachev, Pervez Musharraf, Tony Blair, former CIA Operations Officer Valerie Plame Wilson, the Ploughshares Fund’s Joe Cirincione and Stanford political scientist Scott Sagan. traces the history of the atomic bomb from its origins to the present state of global affairs: nine nations possessing nuclear weapons capabilities and others racing to join them, with the world held in a delicate balance that could be shattered by an act of terrorism, failed diplomacy, or a simple accident. It makes a compelling case for worldwide nuclear disarmament, an issue more topical than ever with President Obama and other world leaders working to revive this goal today. Written and directed by Lucy Walker, Countdown to Zero was screened for attendees of this year’s Global Zero International Conference in Paris and the TED Conference in Long Beach, California.