• 
  Lena Headey

  Jeopardy Mouse
• 
  John Oliver

   Dr. Augustus P Crumplehorn III (2015) (voice)
• 
  Kevin Eldon

  Penfold / Baron Silas Von Penfold / Robo-Penfold
• 
  Dave Lamb

   The Narrator / ... (15 episodes, 2015)
• 
  Morwenna Banks

   The Queen / ... (10 episodes, 2015)
• 
  Rasmus Hardiker

  Count Duckula
• 
  Stephen Fry

   Colonel K / ...
• 
  Alexander Armstrong

  74 episodes, 2015-2017

• 
  Shauna Macdonald

   Professor Squawkencluck / ...
• 
  Marc Silk

   Nero / ...
• 
  Kayvan Novak

   Dr. Loocifer / ...
• 
  Ed Gaughan

   Baron Greenback / ...
• 
  Maya Sondhi

  Coney
• 
  Richard Ayoade

  The Snowman
• 
  Miranda Richardson

  Queen of Weevils

• 
  Richard Osman

  Professor Strontium P. Jellyfishowitz
• 
  Lindsey Russell

  Hissteria
• 
  Ben Willbond

  Professor Ham Hands