The Mystery Cases of Douglas Peterson is a Nelvana original series that premiered from September 6, 1997 to February 26, 2000.

About The Series

  • It centers on Douglas Peterson (voiced by Ashley Johnson), his older sister Yolanda Peterson (voiced by Grey DeLisle), his younger sister Martina Peterson (voiced by Eden Sher), his parents Ophelia Peterson (voiced by Stephanie Morgenstern) and Timothy Peterson (voiced by Alan Tudyk), his love interest Morgan Brooks (voiced by Tracey Moore), his best friend Jimmy Clarkson (voiced by Nancy Cartwright) whose love interest is Carla Anderson (voiced by Kelly Sheridan), his main rival Andy Rockwell (voiced by Pamela Adlon) whose love interest is Georgia Logan (voiced by Katie Griffin) and his pet dog Samuel (voiced by Fred Newman).


  1. Douglas Peterson (Ashley Johnson)
  2. Yolanda Peterson (Grey DeLisle)
  3. Martina Peterson (Eden Sher)
  4. Ophelia Peterson (Stephanie Morgenstern)
  5. Timothy Peterson (Alan Tudyk)
  6. Morgan Brooks (Tracey Moore)
  7. Jimmy Clarkson (Nancy Cartwright)
  8. Carla Anderson (Kelly Sheridan)
  9. Andy Rockwell (Pamela Adlon)
  10. Georgia Logan (Katie Griffin)
  11. Samuel (Fred Newman)


Season 1

Season 2

Season 3

Production Companies

  1. Film Roman Inc.
  2. Nelvana


  • This is the show where it premiered on Fox Family.
  • Douglas is about 12 years old.
  • The series is based on the comics.
  • Yolanda and Martina are Douglas' sisters.
  • The opening theme is performed by Barenaked Ladies.
  • When in Qubo Channel reruns, the 2004 Nelvana logo appears after the Film Roman logo.

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