• 
  Mo Rocca

   Himself / ... (60 episodes, 2014-2017)
• 
  Alison Ward

   Herself / ... (60 episodes, 2014-2017)
• 
  Adam Yamaguchi

   Himself / ... (60 episodes, 2014-2017)
• 
  Albert Lawrence

  33 episodes, 2017-2018
• 
  Kristen Gallerneaux

  Self
• 
  Marc Greuther

  Self
• 
  Matt Anderson

  Self
• 
  Lonnie Johnson

  Self - Inventor of Super Soaker

• 
  Pietro Filardo

  Self
• 
  John P. Claude

  Self
• 
  Henry Harris-Burland

  Self - StarShip Technologies
• 
  Jennifer Ernst

  Self
• 
  Martin Riddiford

  Self - Co-Inventor of Gravitylight
• 
  Tommy Yang

  Self
• 
  Joseph Rosenkrantz

  Inventor

• 
  Madaline Webb

  Self - Lab Kid
• 
  Zach King

  Self