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Appearances
NOVA
Guest cast, played by Joe Morton
- Episode 44x17: Poisoned Water (May 31, 2017)
- Episode 45x12: Addiction (Oct 17, 2018)
Guest cast, played by Zachary Quinto
- Episode 46x12: The Planets: Inner Worlds (Jul 24, 2019)
- Episode 46x13: The Planets: Mars (Jul 24, 2019)
- Episode 46x14: The Planets: Jupiter (Jul 31, 2019)
- Episode 46x15: The Planets: Saturn (Aug 7, 2019)
- Episode 46x16: The Planets: Ice Worlds (Aug 14, 2019)
Guest cast, played by Keith David
- Episode 46x19: Rise of the Mammals (Oct 30, 2019)
- Episode 46x22: The Violence Paradox (Nov 20, 2019)
- Episode 47x05: Cuba's Cancer Hope (Apr 1, 2020)
- Episode 49x18: Computer v. Crime (Oct 12, 2022)
Guest cast, played by Craig Sechler
- Episode 39x17: Deadliest Tornadoes (Apr 11, 2012)
- Episode 41x09: Asteroid: Doomsday or Payday? (Nov 20, 2013)
- Episode 41x20: Why Sharks Attack (May 7, 2014)
- Episode 42x07: Bigger Than T. Rex (Nov 5, 2014)
- Episode 44x23: Killer Volcanoes (Oct 25, 2017)
- Episode 44x24: Killer Hurricanes (Nov 1, 2017)
- Episode 44x25: Killer Floods (Nov 8, 2017)
- Episode 44x27: Bird Brain (Dec 20, 2017)
- Episode 44x28: Day the Dinosaurs Died (Dec 27, 2017)
- Episode 45x07: Rise of the Superstorms (Jun 27, 2018)
- Episode 45x13: Flying Supersonic (Oct 24, 2018)
- Episode 46x01: Pluto and Beyond (Jan 2, 2019)
- Episode 46x18: Look Who's Driving (Oct 23, 2019)
- Episode 46x23: Animal Espionage (Nov 27, 2019)
- Episode 47x07: Decoding COVID-19 (May 13, 2020)
- Episode 47x12: Secret Mind of Slime (Sep 16, 2020)
- Episode 47x16: Touching the Asteroid (Oct 21, 2020)
- Episode 48x05: Looking for Life on Mars (Feb 24, 2021)
- Episode 48x11: Ship That Changed the World (Jun 2, 2021)
- Episode 49x15: Ultimate Space Telescope (Jul 13, 2022)
- Episode 50x04: New Eye on the Universe (Feb 22, 2023)
Guest cast, played by Jay O. Sanders
- Episode 35x05: Judgment Day: Intelligent Design on Trial (Nov 13, 2007)
- Episode 38x01: Building the Great Cathedrals (Oct 19, 2010)
- Episode 39x04: Iceman Murder Mystery (Oct 26, 2011)
- Episode 40x01: Secrets of the Viking Sword (Oct 10, 2012)
- Episode 40x14: Ancient Computer (Apr 3, 2013)
- Episode 41x15: Great Cathedral Mystery (Feb 12, 2014)
- Episode 42x14: Colosseum: Roman Death Trap (Feb 11, 2015)
- Episode 42x15: Petra: Lost City of Stone (Feb 18, 2015)
- Episode 42x16: Hagia Sophia: Istanbul's Ancient Mystery (Feb 25, 2015)
- Episode 43x01: Dawn of Humanity (Sep 16, 2015)
- Episode 43x03: Secrets of Noah's Ark (Oct 7, 2015)
- Episode 43x12: Mystery Beneath the Ice (Jan 20, 2016)
- Episode 43x16: Iceman Reborn (Feb 17, 2016)
- Episode 44x05: Treasures of the Earth: Gems (Nov 2, 2016)
- Episode 44x06: Treasures of the Earth: Metals (Nov 9, 2016)
- Episode 44x07: Treasures of the Earth: Power (Nov 16, 2016)
- Episode 44x20: Secrets of the Shining Knight (Oct 4, 2017)
- Episode 44x21: Ghosts of Stonehenge (Oct 11, 2017)
- Episode 45x03: First Face of America (Feb 7, 2018)
- Episode 45x05: Prediction by the Numbers (Feb 28, 2018)
- Episode 45x06: Decoding the Weather Machine (Apr 18, 2018)
- Episode 45x08: Transplanting Hope (Sep 26, 2018)
- Episode 45x14: Last B-24 (Nov 7, 2018)
- Episode 45x17: Apollo's Daring Mission (Dec 26, 2018)
- Episode 46x07: Saving the Dead Sea (Apr 24, 2019)
- Episode 46x09: First Horse Warriors (May 15, 2019)
- Episode 46x20: Dead Sea Scroll Detectives (Nov 6, 2019)
- Episode 46x21: Decoding da Vinci (Nov 13, 2019)
- Episode 47x04: Mysteries of Sleep (Feb 26, 2020)
- Episode 49x01: High-Risk High-Rise (Jan 5, 2022)
Guest cast, played by Eric Meyers
- Episode 39x18: Why Ships Sink (Apr 18, 2012)
- Episode 42x08: Emperor's Ghost Army (Nov 12, 2014)
- Episode 42x12: Sunken Ship Rescue (Jan 21, 2015)
- Episode 43x18: Vikings Unearthed (Apr 6, 2016)
- Episode 43x21: Operation Lighthouse Rescue (May 4, 2016)
- Episode 44x11: Ultimate Cruise Ship (Feb 8, 2017)
- Episode 44x16: Chinese Chariot Revealed (May 17, 2017)
- Episode 44x22: Secrets of the Forbidden City (Oct 18, 2017)
- Episode 44x26: Extreme Animal Weapons (Nov 22, 2017)
- Episode 45x04: Great Escape at Dunkirk (Feb 14, 2018)
- Episode 45x09: Operation Bridge Rescue (Oct 3, 2018)
- Episode 45x15: Thai Cave Rescue (Nov 14, 2018)
- Episode 45x16: World's Fastest Animal (Nov 21, 2018)
- Episode 46x02: Einstein's Quantum Riddle (Jan 9, 2019)
- Episode 46x03: Kīlauea: Hawaiʻi on Fire (Jan 23, 2019)
- Episode 46x04: Decoding the Great Pyramid (Feb 6, 2019)
- Episode 46x05: Rise of the Rockets (Feb 13, 2019)
- Episode 46x10: Lost Viking Army (May 22, 2019)
- Episode 46x11: Back to the Moon (Jul 10, 2019)
- Episode 46x17: Why Bridges Collapse (Oct 16, 2019)
- Episode 47x02: Dog Tales (Feb 12, 2020)
- Episode 47x03: Cat Tales (Feb 19, 2020)
- Episode 47x09: Eagle Power (May 20, 2020)
- Episode 47x18: Saving Notre Dame (Nov 25, 2020)
- Episode 48x14: Particles Unknown (Oct 6, 2021)
- Episode 49x13: Why Ships Crash (May 18, 2022)
- Episode 50x01: London Super Tunnel (Feb 1, 2023)
Guest cast, played by Jamie Effros
- Episode 36x12: Rat Attack (Feb 24, 2009)
- Episode 38x15: Venom: Nature's Killer (Feb 23, 2011)
- Episode 39x15: Cracking Your Genetic Code (Mar 28, 2012)
- Episode 44x12: The Origami Revolution (Feb 15, 2017)
- Episode 49x17: Ending HIV in America (Oct 5, 2022)
Guest cast, played by Lance Lewman
- Episode 37x04: Becoming Human Part 1: First Steps (Nov 3, 2009)
- Episode 37x05: Becoming Human Part 2: Birth of Humanity (Nov 10, 2009)
- Episode 37x06: Becoming Human Part 3: Last Human Standing (Nov 17, 2009)
- Episode 37x18: Mt. St. Helens Back from the Dead (May 4, 2010)
- Episode 39x13: Ice Age Death Trap (Feb 1, 2012)
- Episode 40x03: Mystery of Easter Island (Nov 7, 2012)
- Episode 41x10: Alien Planets Revealed (Jan 8, 2014)
- Episode 41x17: Inside Animal Minds: Bird Genius (Apr 9, 2014)
- Episode 41x18: Inside Animal Minds: Dogs & Super Senses (Apr 16, 2014)
- Episode 41x19: Inside Animal Minds: Who's the Smartest? (Apr 23, 2014)
- Episode 42x05: Ben Franklin's Balloons (Oct 22, 2014)
- Episode 42x11: Big Bang Machine (Jan 14, 2015)
Guest cast, played by Corey Johnson
- Episode 38x16: Japan's Killer Quake (Mar 30, 2011)
- Episode 40x05: Inside the Megastorm (Nov 18, 2012)
- Episode 40x07: Decoding Neanderthals (Jan 9, 2013)
- Episode 40x13: Meteor Strike (Mar 27, 2013)
- Episode 42x10: First Man on the Moon (Dec 3, 2014)
Guest cast, played by Lane West
- Episode 45x02: The Impossible Flight (Jan 31, 2018)
Guest cast, played by Miles O'Brien
- Episode 46x08: Inside the Megafire (May 8, 2019)
- Episode 48x10: Great Electric Airplane Race (May 26, 2021)
Guest cast, played by Ronan Summers
- Episode 46x06: The Next Pompeii (Feb 20, 2019)
Guest cast, played by Parker Sawyers
- Episode 45x10: Volatile Earth: Volcano on Fire (Oct 10, 2018)
- Episode 45x11: Volatile Earth: Volcano on the Brink (Oct 10, 2018)
Guest cast, played by S. Epatha Merkerson
- Episode S47 Special: Blood Sugar Rising: America's Hidden Diabetes Epidemic (Apr 15, 2020)
Guest cast, played by Hope Davis
- Episode 47x06: The Truth About Fat (Apr 8, 2020)
Guest cast, played by Liev Schreiber
- Episode 29x16: Why the Towers Fell (Apr 30, 2002)
Guest cast, played by Sean Barrett
- Episode 26x11: The Beast of Loch Ness (Jan 12, 1999)
Guest cast, played by Michael C. Hall
- Episode 47x15: Nature's Fear Factor (Oct 14, 2020)
Guest cast, played by Ted Marcoux
- Episode 41x16: Wild Predator Invasion (Apr 2, 2014)