• 
  Mark Williams-Thomas

   Himself - The Investigator (4 episodes, 2016)
• 
  Chris Hackett

   Himself - Investigation Team (4 episodes, 2016)
• 
  Sam Gillingham

   Herself - Daughter (4 episodes, 2016)
• 
  Rick Warden

  4 episodes, 2016
• 
  Jason Allen

  4 episodes, 2016
• 
  Frances Millar

  4 episodes, 2016
• 
  Alice Harding

  4 episodes, 2016
• 
  Tanya Winsor

  4 episodes, 2016

• 
  Ayse Jamieson

  2 episodes, 2018
• 
  Nazir Afzal

  Self - Former Chief Crown Prosecutor for North West England
• 
  Patricia Causley

  Self
• 
  David France

  Anthony Hackett-Jones
• 
  Lesley Gardiner

  Self - Investigation Team
• 
  Neil Gillingham

  Self - Sam's son
• 
  Rebecca Hoggarth

  Self - Investigation Team

• 
  Jackie McKinley

  Self - Osteoarchaeologist
• 
  Dave Norcott

  Self - Geoarchaeologist
• 
  David Bannerman

  Peter Tobin
• 
  Eve Perry

  Louise Kay