• 
  Tom Alter

  Herr Oberart
• 
  Edward Baker-Duly

  Professor Seseman
• 
  Helen Baxendale

  Seb
• 
  Daniela Denby-Ashe

  Gertrude
• 
  Bill Nighy

  Grandpa
• 
  Michelle Butt

  Head Teacher
• 
  Illy

  Skinny Villager
• 
  Daniel Feuerriegel

  Hunter

• 
  Olivia Grant

  Miss Rottenmeier
• 
  Perry Eggleton

  Peter
• 
  Max Raphael

  Otto
• 
  Sam Allison

  Heidi
• 
  Mimi Slinger

  Clara
• 
  Simon Peter Ancellon

  Alfie
• 
  John Smeathers

  Council Leader

• 
  Sinéad Daly

  Maid #2
• 
  Lilly Roberts

  Maid
• 
  Mark Williams

  Henry
• 
  Mike Francis Carvalho

  Hunter (2)