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Appearances
How the Universe Works
Main cast, played by Hakeem Oluseyi
- Episode 3x01: Journey from the Center of the Sun (Jul 9, 2014)
- Episode 3x02: The End of the Universe (Jul 16, 2014)
- Episode 3x04: First Second of the Big Bang (Jul 30, 2014)
- Episode 3x06: Weapons of Mass Extinction (Aug 13, 2014)
- Episode 3x07: Did a Black Hole Build the Milky Way? (Aug 20, 2014)
- Episode 3x08: Our Voyage to the Stars (aka Starman) (Aug 27, 2014)
- Episode 5x01: Mystery of Planet 9 (Nov 29, 2016)
- Episode 5x02: Black Holes: The Secret Origin (Dec 6, 2016)
- Episode 5x04: Stars That Kill (Jan 10, 2017)
- Episode 5x05: The Universe's Deadliest (Jan 17, 2017)
- Episode 5x06: Life and Death on the Red Planet (Jan 24, 2017)
- Episode 5x07: The Dark Matter Enigma (Jan 31, 2017)
- Episode 5x08: Strangest Alien Worlds (Feb 7, 2017)
- Episode 6x01: Are Black Holes Real? (Jan 9, 2018)
- Episode 6x02: Twin Suns: The Alien Mysteries (Jan 16, 2018)
- Episode 6x03: Dark History of the Solar System (Jan 23, 2018)
- Episode 6x04: Death of the Milky Way (Jan 30, 2018)
- Episode 6x05: Uranus & Neptune: Rise of the Ice Giants (Feb 6, 2018)
- Episode 6x06: Secret History of Mercury (Feb 13, 2018)
- Episode 6x07: The Quasar Enigma (Feb 20, 2018)
- Episode 6x08: Strange Lives of Dwarf Planets (Feb 27, 2018)
- Episode 6x09: War on Asteroids (Mar 6, 2018)
- Episode 6x10: Mystery of Spacetime (Mar 13, 2018)
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x03: The Interstellar Mysteries (Jan 22, 2019)
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 7x05: Secret World of Nebulas (Feb 5, 2019)
- Episode 7x06: Did the Big Bang Really Happen? (Feb 12, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 7x08: Hunt for Alien Life (Feb 26, 2019)
- Episode 7x09: Finding the New Earth (Mar 5, 2019)
- Episode 7x10: Cassini's Final Secrets (Mar 12, 2019)
- Episode 8x01: Asteroid Apocalypse: The New Threat (Jan 2, 2020)
- Episode 8x02: NASA's Journey to Mars (Jan 9, 2020)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x06: When NASA Met Jupiter (Feb 6, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x02: Mission to a Comet (Mar 31, 2021)
- Episode 9x03: Secrets of the Sun (Apr 7, 2021)
- Episode 9x04: Aliens of the Microcosmos (Apr 14, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x10: Gravitational Waves Revealed (May 26, 2021)
- Episode 9x11: Mystery of Alien Worlds (Jun 2, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x04: Dark History of Earth (Mar 27, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
- Episode S05 Special: Most Amazing Discoveries (Nov 22, 2016)
Main cast, played by James S. Bullock
- Episode 3x02: The End of the Universe (Jul 16, 2014)
- Episode 3x07: Did a Black Hole Build the Milky Way? (Aug 20, 2014)
- Episode 3x09: The Search for a Second Earth (Sep 3, 2014)
- Episode 5x01: Mystery of Planet 9 (Nov 29, 2016)
- Episode 5x02: Black Holes: The Secret Origin (Dec 6, 2016)
- Episode 5x04: Stars That Kill (Jan 10, 2017)
- Episode 5x05: The Universe's Deadliest (Jan 17, 2017)
- Episode 5x07: The Dark Matter Enigma (Jan 31, 2017)
- Episode 6x01: Are Black Holes Real? (Jan 9, 2018)
- Episode 6x02: Twin Suns: The Alien Mysteries (Jan 16, 2018)
- Episode 6x04: Death of the Milky Way (Jan 30, 2018)
- Episode 6x07: The Quasar Enigma (Feb 20, 2018)
- Episode 6x10: Mystery of Spacetime (Mar 13, 2018)
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x03: The Interstellar Mysteries (Jan 22, 2019)
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 7x05: Secret World of Nebulas (Feb 5, 2019)
- Episode 7x06: Did the Big Bang Really Happen? (Feb 12, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 7x08: Hunt for Alien Life (Feb 26, 2019)
- Episode 7x10: Cassini's Final Secrets (Mar 12, 2019)
- Episode 8x01: Asteroid Apocalypse: The New Threat (Jan 2, 2020)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x03: Secrets of the Sun (Apr 7, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x11: Mystery of Alien Worlds (Jun 2, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x04: Dark History of Earth (Mar 27, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
- Episode S05 Special: Most Amazing Discoveries (Nov 22, 2016)
Main cast, played by Paul M. Sutter
- Episode 6x01: Are Black Holes Real? (Jan 9, 2018)
- Episode 6x02: Twin Suns: The Alien Mysteries (Jan 16, 2018)
- Episode 6x04: Death of the Milky Way (Jan 30, 2018)
- Episode 6x07: The Quasar Enigma (Feb 20, 2018)
- Episode 6x10: Mystery of Spacetime (Mar 13, 2018)
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x03: The Interstellar Mysteries (Jan 22, 2019)
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 7x05: Secret World of Nebulas (Feb 5, 2019)
- Episode 7x06: Did the Big Bang Really Happen? (Feb 12, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 7x08: Hunt for Alien Life (Feb 26, 2019)
- Episode 7x09: Finding the New Earth (Mar 5, 2019)
- Episode 7x10: Cassini's Final Secrets (Mar 12, 2019)
- Episode 8x01: Asteroid Apocalypse: The New Threat (Jan 2, 2020)
- Episode 8x02: NASA's Journey to Mars (Jan 9, 2020)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x06: When NASA Met Jupiter (Feb 6, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x02: Mission to a Comet (Mar 31, 2021)
- Episode 9x03: Secrets of the Sun (Apr 7, 2021)
- Episode 9x04: Aliens of the Microcosmos (Apr 14, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x10: Gravitational Waves Revealed (May 26, 2021)
- Episode 9x11: Mystery of Alien Worlds (Jun 2, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x04: Dark History of Earth (Mar 27, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 10x06: Voyager's Ultimate Mission (Apr 10, 2022)
- Episode 11x01: The Moons of Saturn (Mar 5, 2023)
- Episode 11x02: A Robot's Guide to Mars (Mar 12, 2023)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
- Episode 11x04: Asteroid: Countdown to Catastrophe (Mar 26, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
Guest cast, played by Alex Filippenko
- Episode 3x01: Journey from the Center of the Sun (Jul 9, 2014)
- Episode 3x02: The End of the Universe (Jul 16, 2014)
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
Guest cast, played by Saul Perlmutter
- Episode 3x02: The End of the Universe (Jul 16, 2014)
Guest cast, played by David Spergel
- Episode 3x02: The End of the Universe (Jul 16, 2014)
Guest cast, played by Brenda Frye
- Episode 3x02: The End of the Universe (Jul 16, 2014)
Guest cast, played by Julie McEnery
- Episode 3x06: Weapons of Mass Extinction (Aug 13, 2014)
Guest cast, played by Risa Wechsler
- Episode 3x07: Did a Black Hole Build the Milky Way? (Aug 20, 2014)
Guest cast, played by Fiona Harrison
- Episode 3x07: Did a Black Hole Build the Milky Way? (Aug 20, 2014)
Guest cast, played by Ben Oppenheimer
- Episode 3x09: The Search for a Second Earth (Sep 3, 2014)
Guest cast, played by Todd Thompson
- Episode 5x04: Stars That Kill (Jan 10, 2017)
- Episode 5x05: The Universe's Deadliest (Jan 17, 2017)
Guest cast, played by Natalie Gosnell
- Episode 5x04: Stars That Kill (Jan 10, 2017)
Guest cast, played by Jedidah Isler
- Episode 5x05: The Universe's Deadliest (Jan 17, 2017)
- Episode 6x07: The Quasar Enigma (Feb 20, 2018)
Guest cast, played by Grant Tremblay
- Episode 6x01: Are Black Holes Real? (Jan 9, 2018)
- Episode 6x07: The Quasar Enigma (Feb 20, 2018)
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 7x06: Did the Big Bang Really Happen? (Feb 12, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x10: Gravitational Waves Revealed (May 26, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
Guest cast, played by Dirk Terrell
- Episode 6x02: Twin Suns: The Alien Mysteries (Jan 16, 2018)
Guest cast, played by Idan Ginsburg
- Episode 6x02: Twin Suns: The Alien Mysteries (Jan 16, 2018)
Guest cast, played by Amber Straughn
- Episode 7x01: Nightmares of Neutron Stars (Jan 8, 2019)
- Episode 7x02: When Supernovas Strike (Jan 15, 2019)
- Episode 7x05: Secret World of Nebulas (Feb 5, 2019)
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
- Episode 7x08: Hunt for Alien Life (Feb 26, 2019)
- Episode 7x09: Finding the New Earth (Mar 5, 2019)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 8x09: Earth's Death Orbit (Feb 27, 2020)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
Guest cast, played by Avi Loeb
- Episode 7x03: The Interstellar Mysteries (Jan 22, 2019)
- Episode 8x03: Hunt for Alien Evidence (Jan 16, 2020)
Guest cast, played by Priyamvada Natarajan
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 7x06: Did the Big Bang Really Happen? (Feb 12, 2019)
Guest cast, played by Chiara Mingarelli
- Episode 7x04: How Black Holes Made Us (Jan 29, 2019)
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
- Episode 9x01: Journey to a Black Hole (Mar 24, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x08: Secret Lives of Neutrinos (May 12, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x10: Gravitational Waves Revealed (May 26, 2021)
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x03: Hunt for Dark Matter (Mar 20, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 10x06: Voyager's Ultimate Mission (Apr 10, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
- Episode 11x04: Asteroid: Countdown to Catastrophe (Mar 26, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
Guest cast, played by Amir Caspi
- Episode 7x09: Finding the New Earth (Mar 5, 2019)
Guest cast, played by Matthew O'Dowd
- Episode 8x04: Death of the Last Stars (Jan 23, 2020)
- Episode 8x05: Secrets of Time Travel (Jan 30, 2020)
- Episode 8x07: Edge of the Universe (Feb 13, 2020)
Guest cast, played by Peter Galison
- Episode 8x08: Monsters of the Milky Way (Feb 20, 2020)
Guest cast, played by Jessie Christiansen
- Episode 9x02: Mission to a Comet (Mar 31, 2021)
- Episode 9x03: Secrets of the Sun (Apr 7, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x11: Mystery of Alien Worlds (Jun 2, 2021)
- Episode 10x04: Dark History of Earth (Mar 27, 2022)
- Episode 10x06: Voyager's Ultimate Mission (Apr 10, 2022)
- Episode 11x01: The Moons of Saturn (Mar 5, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
Guest cast, played by Gibor Basri
- Episode 9x03: Secrets of the Sun (Apr 7, 2021)
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x06: War of the Galaxies (Apr 28, 2021)
- Episode 9x07: The Next Supernova (May 5, 2021)
Guest cast, played by Sarafina El-Badry Nance
- Episode 10x01: Secrets of the Cosmic Web (Mar 6, 2022)
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x04: Dark History of Earth (Mar 27, 2022)
- Episode 10x05: Hunt for the Universe's Origin (Apr 3, 2022)
- Episode 11x03: Most Violent Event in the Universe (Mar 19, 2023)
- Episode 11x05: Solar System Special (Apr 2, 2023)
Guest cast, played by Eric R Christian
- Episode 10x02: Curse of the Cosmic Rays (Mar 13, 2022)
- Episode 10x06: Voyager's Ultimate Mission (Apr 10, 2022)