• 
  J.T. Corbitt

  Gene Otto
• 
  Holland Roden

  Bridget Cleary
• 
  Matty Ferraro

   Dieter (1 episode)
• 
  Cassady McClincy

   Greta Hetfelderz (1 episode)
• 
  Judd Lormand

   Dr. Nolan (1 episode)
• 
  Clark Moore

   Jens Hetfelderz (1 episode)
• 
  Joe Knezevich

   Thomas Otto (1 episode)
• 
  Michael Patrick Lane

   Gene otto (1 episode)

• 
  Cathal Pendred

   Michael Cleary (1 episode)
• 
  Corey Creque

   Hanging Teen Victim (1 episode)
• 
  Ruby Nasworthy

   Angelene Ionesco (1 episode)
• 
  Aaron Mahnke

   Narrator (6 episodes, 2017)
• 
  Paula Malcomson

  Mary Webster
• 
  Maimie McCoy

  Elizabeth Bathory
• 
  Jürgen Prochnow

  Andreas Gruber

• 
  Emmett J Scanlan

  William Burke
• 
  Colm Feore

  Dr. Walter Freeman
• 
  Adam Goldberg

  Peter Stubbe
• 
  Robert Patrick

  Reverend Eliakim Phelps
• 
  Campbell Scott

  George Brown
• 
  Kristin Bauer van Straten

  Minnie Otto
• 
  Numan Acar

  Dirvick Mirandesh
• 
  Hebe Beardsall

  Verity Hollister
• 
  Emmet Byrne

  William Hare
• 
  Rosalind Eleazar

  Ava
• 
  Thomas Kretschmann

  Inspector Georg Reingruber
• 
  Steven Berkoff

  Dr. Kristoff Brehovy
• 
  Joshua Bowman

  Jack Parsons
• 
  Alicia Witt

  Marjorie Cameron