• 
  Marc Kudisch

  Ty Rathbone
• 
  Joanna Adler

   Dr. Creek (1 episode, 2016)
• 
  Andrew Dolan

   Officer Dietz (1 episode, 2016)
• 
  Jackie Earle Haley

  The Terror
• 
  Brendan Hines

   Superian (1 episode, 2016)
• 
  Peter Serafinowicz

  The Tick
• 
  Malachi Weir

   Thug #2 (1 episode, 2016)
• 
  Henry Yuk

   Shaman (1 episode, 2016)

• 
  Griffin Newman

  Arthur Everest
• 
  Valorie Curry

   Dot Everest (1 episode, 2016)
• 
  Berto Colon

   Thug #1 (1 episode, 2016)
• 
  Richie Moriarty

   Mr. Everest (1 episode, 2016)
• 
  Christian Navarro

   Sidekick (1 episode, 2016)
• 
  Yara Martinez

   Ms. Lint (1 episode, 2016)
• 
  Kyle Catlett

  Young Arthur

• 
  Siraj Huda

   Cab Driver (1 episode, 2016)
• 
  Sonam Kunlingtse

   Herder (1 episode, 2016)
• 
  Ken Marks

   Supervisor (1 episode)
• 
  Scott Speiser

   The Punishment (1 episode)
• 
  Joe Holt

   Detective Green (1 episode)
• 
  Meredith Forlenza

   Detective Brown (1 episode)
• 
  Michael Mcfadden

   Thug #3 (1 episode)
• 
  Kameron Omidian

   Thug #1 (1 episode)
• 
  John Pirkis

   Dr. Karamazov (2 episodes)
• 
  Kahlil Ashanti

  Goat
• 
  Ryan Woodle

  VLM
• 
  Paul Moon

  Dennis
• 
  Joshua Schubart

  Frank
• 
  Michael Cerveris

  Ramses IV
• 
  Tyler Bunch

  5 episodes, 2017-2018
• 
  François Chau

  5 episodes, 2017-2018
• 
  Patricia Kalember

  5 episodes, 2017-2018
• 
  Devin Ratray

  10 episodes, 2017-2018
• 
  Alan Tudyk

  7 episodes, 2017-2018
• 
  Matthew Robert Gehring

  5 episodes, 2017-2018
• 
  Dawn McGee

  5 episodes, 2018