• 
  Daniel Noel

   Father Roundhay (2 episodes, 2016)
• 
  Ned Donovan

   Porter (2 episodes, 2016)
• 
  Herlin Navarro

   Detective Antonia Gregson (3 episodes, 2016)
• 
  Max Ater

   Detective Geoff Lestrade (3 episodes, 2016)
• 
  Todd Zsiga

   Officer Martin (2 episodes, 2016)
• 
  Lisa Bunker

  Dr. Johanna Watson
• 
  Cherry Lemonade

  Mr. Hudson
• 
  Anna Doyle

  Owena Tregennis

• 
  Helen Davies

  Sherlock Holmes
• 
  Mannie De Castro

  Pierre
• 
  Aniefiok Ekong

  Dr. Leon Sterndale
• 
  Marta Rymer

  Miss Mary Sutherland
• 
  Inayah Burton

  Dr. Patricia Trevelyan
• 
  Anabel Graetz

  Charlotte Agnes Milverton
• 
  Eric Lindgren

  Mr. James Windibank

• 
  Leslie Trentalange

  Morgan Tregennis
• 
  Jenny Anastasoff

  Ms. Melissa Sutherland
• 
  John Hickson

  Mr. Blessington
• 
  Michelle Violette

  Myra Croft-Holmes