4,835 votes


National Geographic 2014

Famed astrophysicist Neil deGrasse Tyson provides clarity for the vision of the cosmos as he voyages across the universe with never-before-told stories that delve into the scientific concepts of the laws of gravity and the origins of space and time.

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The 10 Worst Episodes of Cosmos

Cosmos - S2E13

#1 - Seven Wonders of The New World


Season 2 - Episode 13

Take a trip to the 2039 New York World’s Fair, where the problems we now consider hopeless have been solved and thrilling possibilities exist.

The episode was rated #1 Worst episode of Cosmos from 92 votes.

Cosmos - S2E5

#2 - The Cosmic Connectome


Season 2 - Episode 5

A voyage of discovery through the evolution of consciousness with stops in ancient Greece, a visit to the largest life form on Earth, into the poignant dream of an abandoned orphan that opened the way to our understanding of the architecture of thought and beyond to a vision of a galactic network of thought.

The episode was rated #2 Worst episode of Cosmos from 114 votes.

Cosmos - S2E12

#3 - Coming of Age In The Anthropocene


Season 2 - Episode 12

A baby is born on the day the show premieres. What kind of world can she expect to grow up in? One of her possible futures is explored.

The episode was rated #3 Worst episode of Cosmos from 105 votes.

Cosmos - S2E11

#4 - Shadows of Forgotten Ancestors


Season 2 - Episode 11

An exploration of human potential for change, concluding with the story of one of history's greatest monster and his virtuous transformation.

The episode was rated #4 Worst episode of Cosmos from 105 votes.

Cosmos - S2E7

#5 - The Search for Intelligent Life on Earth


Season 2 - Episode 7

A revelation of the hidden underground network that is a collaboration of four kingdoms of life, and a true first contact story between humans and beings who communicate in a symbolic language and have maintained a representative democracy for many tens of millions of years.

The episode was rated #5 Worst episode of Cosmos from 116 votes.

Cosmos - S2E6

#6 - The Man of a Trillion Worlds


Season 2 - Episode 6

A child lies on the rug of a tenement dreaming of interstellar adventures. At the dawn of the space age, a young Carl Sagan's career is forged in the clash of his mentors, two scientific titans. Sagan goes on realize his childhood dreams, to carry their research forward and communicate its significance to the whole world.

The episode was rated #6 Worst episode of Cosmos from 120 votes.

Cosmos - S2E10

#7 - A Tale of Two Atoms


Season 2 - Episode 10

How a deadly embrace between science and state altered the fate of the world, and a gripping cautionary tale of mass casualty and unlikely survival.

The episode was rated #7 Worst episode of Cosmos from 102 votes.

Cosmos - S2E3

#8 - Lost City of Life


Season 2 - Episode 3

A new vision of genesis at the bottom of the blood red sea of the infant Earth. And the story of the man who found the first clues to life's beginning in a green jewel. As he searched for life's origin, he risked his own, daring to toy with his Nazi tormentors.

The episode was rated #8 Worst episode of Cosmos from 133 votes.

Cosmos - S2E1

#9 - Ladder to the Stars


Season 2 - Episode 1

An adventure spanning billions of years into the evolution of life and consciousness. A visit to a 100,000-year-old laboratory. The story of the change in life-style that radically altered human existence and the life of the heretic who found god in the book of nature, opening our way to the stars.

The episode was rated #9 Worst episode of Cosmos from 194 votes.

Cosmos - S2E4

#10 - Vavilov


Season 2 - Episode 4

In the first half of the 20th century pioneering geneticist Nikolai Vavilov traveled 5 continents assembling a treasury of the worlds seeds. He dreamed that science could be the means to end hunger. His refusal to tell a scientific lie cost him his life. The heroism of his colleagues and its direct impact on your life is one of the most stirring stories in the history of science.

The episode was rated #10 Worst episode of Cosmos from 129 votes.

Cosmos - S2E8
#11 - The Sacrifice of Cassini
Season 2 - Episode 8

The mysterious untold story of the scientist who figured out how to go the Moon while fighting for his life in a WWI trench. He wrote a letter to fifty years in the future. It made the Apollo Mission possible. And the saga of the twenty-year long odyssey of a robotic explorer ordered to commit suicide on another world.

The episode was rated #1 Worst episode of Cosmos from 110 votes.

Cosmos - S2E2
#12 - The Fleeting Grace of the Habitable Zone
Season 2 - Episode 2

There is no refuge from change in the cosmos. There will come a time in the life of the Sun when Earth will no longer be a home for us. The story of our ancestors who rose to a comparable challenge and a long-term vision of our future on other worlds.

The episode was rated #2 Worst episode of Cosmos from 145 votes.

Cosmos - S2E9
#13 - Magic Without Lies
Season 2 - Episode 9

Meet the man who stumbled on a hole in the reality of quantum mechanics and the still-unfolding technology that made it possible.

The episode was rated #3 Worst episode of Cosmos from 111 votes.

Cosmos - S1E6
#14 - Deeper, Deeper, Deeper Still
Season 1 - Episode 6

The Ship of the Imagination ventures on an epic voyage to the bottom of a dewdrop to explore the universe on the smallest scale and observe exotic life forms invisible to the naked eye. Then, host Neil deGrasse Tyson explains the neural network in our brains which determine our sense of smell and memory, and later, he travels deep beneath the surface of the Earth to discover the most mysterious particle we know.

The episode was rated #4 Worst episode of Cosmos from 1278 votes.

Cosmos - S1E7
#15 - The Clean Room
Season 1 - Episode 7

To determine the true age of the Earth, geochemist Clair Patterson developed the uranium-lead dating method to make an unprecedented discovery—calculating Earth's age of 4.5 billion years. But Patterson's groundbreaking discoveries were just beginning. Patterson made it his mission to draw public attention to the detrimental effects of lead in the environment and dedicated his career to fighting against the petroleum and chemical industry, eventually achieving public health's biggest victory of the 20th century.

The episode was rated #5 Worst episode of Cosmos from 1220 votes.

Cosmos - S1E9
#16 - The Lost Worlds of Planet Earth
Season 1 - Episode 9

The Ship of the Imagination embarks on a journey through space and time to grasp how the autobiography of the Earth is written in its atoms, its oceans, its continents and all living things. Later, American geologist Marie Tharp creates the first true map of Earth’s ocean floor, and discovers microscopic life that exists deep beneath the ocean

The episode was rated #6 Worst episode of Cosmos from 1113 votes.

Cosmos - S1E2
#17 - Some of the Things that Molecules Do
Season 1 - Episode 2

Host Neil deGrasse Tyson is on a voyage to explore the relatedness of all livings things and the possible evolution of life in the cosmos. Go on a journey to discover how artificial selection turned the wolf into canine breeds and how natural selection sculpted the complex human eye. Later, Tyson visits the grand Hall of Extinction, a monument to all the broken branches on the tree of life. Retrace the story of life on Earth and the unbroken thread that stretches from the first one-celled organisms to human life.

The episode was rated #7 Worst episode of Cosmos from 2002 votes.

Cosmos - S1E11
#18 - The Immortals
Season 1 - Episode 11

The Ship of the Imagination travels across the cosmos to discover the possibility of beings that live forever and explain why other civilizations perish. Then, visit the Cosmic Calendar of the Future and contemplate what lies ahead with a hopeful vision.

The episode was rated #8 Worst episode of Cosmos from 1024 votes.

Cosmos - S1E12
#19 - The World Set Free
Season 1 - Episode 12

The Ship of the Imagination travels to our near neighbor Venus, where we begin our journey to discover the long history of global warming and the greenhouse effect. Later, explore the detrimental effects of climate change and trace the magnitude of our impact on the Earth’s atmosphere. However, with knowledge, technology and science within our grasp, imagine a hopeful future where we dedicate our efforts to taking care of our home, Planet Earth.

The episode was rated #9 Worst episode of Cosmos from 958 votes.

Cosmos - S1E8
#20 - Sisters of the Sun
Season 1 - Episode 8

Discover the remarkable story of Annie Jump Cannon and Cecilia Payne, two incredible women who challenged conventional wisdom and uncovered the real-life story of the stars. Cannon led a group of astronomers in the early 20th century to catalogue the spectral characters of stars, and two decades later Payne joined forces with Cannon to analyze the data and uncover the chemical compositions of the stars. Later, travel on the Ship of the Imagination to explore the lives and deaths of stars and visit the planet of a star orbiting a globular cluster.

The episode was rated #10 Worst episode of Cosmos from 1130 votes.

Last updated: apr 12, 2021



The most beautiful space documentary ever! I stumbeled over some clips of cosmos on the NationalGeographic YT channel, I got very curious so I did take a look & awwww man - this is one incredible show. [10/10] It has the most stunning animations 3D and 2D - just a freaking eye candy! [09/10] The direction & camera work is superb [09/10] Narration & moderation by Neil deGrasse Tyson is like honey for your ears, I feel like I'm back in kindergarten listening to a history lesson ^_^ [10/10] And the music - awwww man the music ... takes me right back to "Contact (1997)". You know why? Because it's created by the same composer: "Alan Silvestri" the master of "Back to the future", "Predator", "Avengers", ... If you are a soundtrack geek - this is a MUST HEAR! I was moved, I was inspired, it made me wonder & joyful. In 1x07 they even put the oil industry in the pillory (on FOX!). This show is informative, engaging, & literally amazing. ENJOY!


Totally brilliant. Makes the complex and wondrous easy understand with simple context. Having watched each episode of this show I was left feeling somewhat 'small' in the grand scheme of things. Whilst we like to think that things re in our control when all is said and done no-one here on earth has any control at all; the Cosmos has a way of surprising you!


This is my favorite tv show ever. Will never forget this.


This is such a magnificent series, explaining difficult concepts like evolution to both interested and to stubborn people. I hope it succeeds in opening up the minds of people to the wondrous world of science.


An amazing series following the footsteps of Carl Sagan's Cosmos! An interesting and inspiring documentary that I would recommend to everyone! I really hope there will be a season 2 and then more to follow!



The most interesting serial all time!


This is an amazing series. I haven't been this excited to watch a show since Mythbusters. It kept my 12 and 8 year olds amazed and they actually learned.


As awesome as it can be!


Significant content astonishingly presented in a a concise and cohesive way. A must-see series to all thoughtful viewers!

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