• 
  Pamela L. Gay

  6 episodes, 2018
• 
  Brian Wolshon

  5 episodes, 2017-2018
• 
  Matt Kutcher

  23 episodes, 2018-2019
• 
  Harry Prichett

  3 episodes, 2017
• 
  Sian Proctor

  10 episodes, 2017
• 
  Carlo Munoz

  Self - Military Analyst
• 
  Lindsay Moran

  Self - Ex CIA
• 
  Jayde Lovell

  Self - Neuroscientist

• 
  Conor McCourt

  Self - Image Analyst
• 
  Kelly Price

  Self - Biologist
• 
  Angela Fritz

  Self - Meteorologist
• 
  Danni Washington

  Self - Marine Biologist
• 
  Re Monteith

  Self
• 
  John Farrow

  Self - Science Journalist
• 
  Kishore Hari

  Self - Material Scientist

• 
  George Kourounis

  Self - Explorer
• 
  Leslie Samuel

  Self - Biologist
• 
  Harry Pritchett

  Narrator
• 
  Jeff Wise

  Self - Science Journalist