Beginning with the origins of the universe in the Big Bang, Sagan describes the formation of different types of galaxies and anomalies such as galactic collisions and quasars. The episodes moves further into ideas about the structure of the Universe, such as different dimensions (in the imaginary Flatland and four-dimensional hypercubes), an infinite vs. a finite universe, and the idea of an oscillating Universe (similar to that in Hindu cosmology). The search into other ideas such as dark matter and the multiverse is shown, using tools such as the Very Large Array in New Mexico. Cosmos Update shows new information about the odd, irregular surfaces of galaxies and the Milky Way perhaps being a barred spiral galaxy

The simple act of making an apple pie is extrapolated into the atoms and subatomic particles (electrons, protons, and neutrons) necessary. Many of the ingredients necessary are formed of chemical elements formed in the life and deaths of stars (such as our own Sun), resulting in massive red giants and supernovae or collapsing into white dwarfs, neutron stars, pulsars, and even black holes. These produce all sorts of phenomena, such as radioactivity, cosmic rays, and even the curving of spacetime by gravity. Cosmos Update mentions the supernova SN 1987A and neutrino astronomy.

Andrew Graham-Dixon explores how Russia changed from a feudal nation of aristocratic excess to a hotbed of revolution at the beginning of the 20th century and how art moved from being a servant of the state to an agent of its destruction. From monuments that celebrate the absolutism of the tsars to the epic Russian landscape as inspiration; from the design and construction of gold and glittering palaces to the minutiae of diamond-encrusted Faberge eggs; and eventually to the stark and radical paintings of the avant-garde, the journey through Russian art history is one of extraordinary beauty and surprise.

Dr Chris van Tulleken, Dr Hannah Fry and Michael Mosley examine the latest research and explore some of the big questions about Covid-19 and the pandemic it has created. Michael visits the UK government's high-security laboratory Porton Down, where vaccines are being tested. He also uncovers what the experience of the 2002 SARs epidemic reveals about this one. Both were caused by coronaviruses, but certain key changes to today's virus have allowed it to infect the world, where SARs was contained.

Could the source of the world’s deadliest viruses hold the secret to a healthier and longer life? Bats have a sinister reputation as potential sources for some of the deadliest disease outbreaks: Ebola, MERS, SARS, and most recently, the virus behind the COVID-19 global pandemic. Yet scientists are discovering new evidence that bats are biological marvels and may hold a key to longevity. They’re resistant to the diseases they carry and have freakishly long lifespans for their tiny size.
So, what’s their secret? And what else can we learn from their peculiar biology? From caves in Thailand and Texas to labs around the globe, the films meets the scientists who are decoding the superpowers of the bat.

Genetic breakthroughs have shed light on how life evolves in real-time. From filling in the missing links to creating a new species, in the last 50 years scientists have solved some of the biggest mysteries of evolution. In this episode, we look at revolutionary discoveries that shook the world and may shape our future.