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  Rob Bell

   Self - Engineer & Adventurer
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  Tom Ward

   Self - Narrator / ...
• 
  Tom Ward

   Himself - Narrator (6 episodes, 2017)
• 
  Andrew Gough

   Himself - Journalist (6 episodes, 2017)
• 
  Jim Meigs

   Self - Author and Journalist
• 
  Dougal Jerram

   Self - Earth Scientist
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  James S. Corum

   Self - Military Historian
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  Lynette Nusbacher

  Self - Military Historian

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  Dominic Selwood

  Self - Historian & Author
• 
  Sascha Auerbach

  Self - Historian
• 
  Claire Barratt

  Self - Engineer
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  Geoffrey Wawro

  Self - Historian & Author
• 
  Fran Scott

  Self - Scientist
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  Shini Somara

  Self - Engineer
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  Michele Mitchell

  Self - Historian & Author

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  Roma Agrawal

  Self - Structural Engineer
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  Saul David

  Self - Military Historian & Author
• 
  Daniel Dickrell

  Self - Mechanical Engineer
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  Tomoji Kobata

  Self - Former Coal Worker
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  Klint Janulis

  Self - Ex Special Forces Operative
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  James Meigs

  Self - Author and Journalist
• 
  David Caldwell-Evans

  Self - Historian