• 
  Roger Tilling

   Narrator - UK (11 episodes, 2010)
• 
  Peter Klimley

   Himself - Chief Scientist (8 episodes, 2010-2012)
• 
  Mark Keller

   Narrator / ... (18 episodes, 2010-2012)
• 
  Brandon Eyre

   Himself (10 episodes, 2010-2012)
• 
  Nicole Nasby-Lucas

   Herself (11 episodes, 2010)
• 
  Michael Domeier

   Himself (11 episodes, 2010)
• 
  David Olson

   Himself (10 episodes, 2010-2012)
• 
  Brett Mcbride

   Himself (9 episodes, 2010-2012)

• 
  Jody Whitworth

   Herself (9 episodes, 2010-2012)
• 
  Todd Goggins

   Himself (9 episodes, 2010-2012)
• 
  Juan Valencia

   Himself (9 episodes, 2010-2012)
• 
  Luis Torres

   Himself (9 episodes, 2010-2012)
• 
  Dennis Wagner

   Himself (9 episodes, 2010-2012)
• 
  James Ketchum

   Himself - Chief Scientist (8 episodes, 2010-2012)
• 
  Alex Hearn

   Himself - Chief Scientist (8 episodes, 2010-2012)

• 
  Mauricio Hoyos Padilla

   Himself - Chief Scientist (8 episodes, 2010-2012)
• 
  Mark Keller

  18 episodes, 2010-2012
• 
  Mauricio Hoyos

  8 episodes, 2010-2012