• 
  Lance Henriksen

  Doc Sugarfoot
• 
  Henry Winkler

   Uncle King Julien (1 episode, 2014)
• 
  Jeff Bennett

   Willie / ... (5 episodes, 2014)
• 
  Danny Jacobs

   King Julien (voice) (rumored)
• 
  Kevin Michael Richardson

   Maurice (voice) (rumored)
• 
  Andy Richter

   Mort (voice) (rumored)
• 
  Sarah Thyre

   Becca / ... (2 episodes, 2014)
• 
  Debra Wilson

   Masikura (1 episode, 2014)

• 
  India de Beaufort

   Clover (5 episodes, 2014)
• 
  Betsy Sodaro

   Xixi (1 episode, 2014)
• 
  Marcela Duarte

  64 episodes, 2014-2017
• 
  David Krumholtz

  Timo
• 
  Diedrich Bader

  Abner
• 
  David Koechner

  Nurse Phantom
• 
  Dwight Schultz

  Karl

• 
  Bill Fagerbakke

  King Joey
• 
  Rob Paulsen

  Brodney
• 
  JB Blanc

  Mountain Lemur Captain
• 
  John Michael Higgins

  Barty