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Appearances
How the Universe Works
Guest cast, played by Sean Carroll
- Episode 3x02: The End of the Universe (Jul 16, 2014)
- Episode 3x04: First Second of the Big Bang (Jul 30, 2014)
Guest cast, played by Katherine Freese
- Episode 5x07: The Dark Matter Enigma (Jan 31, 2017)
- Episode 6x01: Are Black Holes Real? (Jan 9, 2018)
- Episode 6x10: Mystery of Spacetime (Mar 13, 2018)
- 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 8x07: Edge of the Universe (Feb 13, 2020)
Guest cast, played by Carlos Frenk
- Episode 7x07: Battle of the Dark Universe (Feb 19, 2019)
Guest cast, played by Andrew Pontzen
- Episode 9x05: Curse of the White Dwarf (Apr 21, 2021)
- Episode 9x09: Birth of the Monster Black Holes (May 19, 2021)
- Episode 9x10: Gravitational Waves Revealed (May 26, 2021)
- 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)