• 
  Luke Newman

  The Little Red Doctor
• 
  Chloe Naughton

   Jessica Whitehouse (17 episodes, 2013-2016)
• 
  Daniel Patton

  K-9
• 
  Megan Shirley

  17 episodes, 2015-2018
• 
  Dale Smith

  The Brigadier
• 
  Ryan Hennessy

  The Forehead Doctor
• 
  Dominic Greenwood-Martin

  The Doctor
• 
  Jay McGuinness

  The Blonde Doctor

• 
  Elizabeth Kirk

  Scarlet
• 
  Kai Nelson

  Matt
• 
  Sian Garner-Jones

  Robyn
• 
  James Sutton

  Omega
• 
  Dokka Chapman

  The Valeyard
• 
  Georgia Day

  Olivia Fox
• 
  Jessica Prestage

  Lily Roberts

• 
  Aidan Beardsmore

  Henry Vancouver
• 
  Rob Baines

  Daleks
• 
  Aine Coyle

  Maggie May