Top Billed Cast

1. 

   Debi Derryberry

   James 'Jimmy' Isaac Neutron (voice)

2. 

   Megan Cavanagh

   Judy Neutron / VOX (voice)

3. 

   Mark DeCarlo

   Hugh Neutron / Pilot / Arena Guard (voice)

4. 

   Jeffrey Garcia

   Sheen Estevez (voice)

5. 

   Patrick Stewart

   King Goobot V (voice)

6. 

   Martin Short

   Ooblar (voice)

7. 

   Frank Welker

   Goddard / Poultra (voice)

8. 

   Rob Paulsen

   Carl Wheezer / Mr. and Mrs. Wheezer / Kid in Classroom (voice)

9. 

   Carolyn Lawrence

   Cindy Vortex (voice)

10. 

    Crystal Scales

    Libby Folfax (voice)

11. 

    Candi Milo

    Nick Dean / Britney / PJ (voice)

12. 

    David L. Lander

    Yokian Guard / Gus (voice)

13. 

    Carlos Alazraqui

    Mr. Estevez (voice)

14. 

    Jim Cummings

    Ultra Lord / Mission Control / General Bob (voice)

15. 

    Keith Alcorn

    Bobby / Kid / Control Yokian (voice)

16. 

    Kimberly Brooks

    Zachary / Reporter / Angie / Libby's Mom (voice)

17. 

    Andrea Martin

    Ms. Winfred Fowl (voice)

18. 

    Billy West

    Bobby's Twin Brother (voice) / Butch (voice) / Jailbreak Cop (voice) / Old Man Johnson (voice) / Robobarber (voice) / Flurp Announcer (voice) / Yokian Officer (voice) / Anchor Boy (voice) / Guard (voice)

19. 

    Mary Hart

    Yokian Newscaster #2 (voice)

20. 

    Bob Goen

    Yokian Newscaster #1 (voice)

21. 

    Dee Bradley Baker

    Norad Officer (voice)

22. 

    Laraine Newman

    Hostess (voice)

23. 

    John A. Davis

    Octapuke Kid / Guard / Bennie (voice)

24. 

    Paul Greenberg

    Guard (voice)

25. 

    Mark Menza

    Yokian Incubator Operator (voice)

26. 

    Jeannie Elias

    Little Girl / Camera Person (voice)

27. 

    Michael Hagiwara

    Chris (voice)

28. 

    Richard Allen

    Digital Voice (voice)

29. 

    Brian Capshaw

    Screamer (voice)

30. 

    Cheryl Ray

    Screamer (voice)

31. 

    Matthew Russell

    Hyperactive Kid / Arena Yokian (voice)