Top Billed Cast

1. 

   Richard Steven Horvitz

   Billy / Billybot / Harold / Pale Ghoulish Juror / Chippy the Squirrel (voice) (as Richard Horvitz)

2. 

   Grey DeLisle

   Mandy / Mandroid / Older Mandy / Milkshakes / Some Kid (voice)

3. 

   Greg Eagles

   Grim / Sperg / Pirate #6

4. 

   Vanessa Marshall

   Irwin / Pirate #5 / Unicorn (voice)

5. 

   Maxwell Atoms

   I'll Cut You Guy / Pirate #2 / Horrorbot / Burnt Skeleton Guard (voice)

6. 

   George Ball

   Peequay (voice)

7. 

   Jane Carr

   Bride of Frankenstein (voice)

8. 

   Greg Ellis

   Creeper / Horror's Hand / Pirate #3 / Paperboy (voice)

9. 

   Bart Flynn

   Giant Cyclops / Ugly Pirate (voice)

10. 

    C.H. Greenblatt

    Fred Fredburger / Pirate #4 (voice)

11. 

    Jennifer Hale

    Billy's Mom (voice)

12. 

    Dorian Harewood

    Older Irwin (voice)

13. 

    Phil LaMarr

    Space Villain / Glacier of Evil / Dracula / Judge Roy Spleen / Underworld Cop (voice)

14. 

    Rachael MacFarlane

    2 Headed Parrot (voice)

15. 

    George Segal

    Horror (voice)

16. 

    Armin Shimerman

    General Skarr / Pirate #7 (voice)

17. 

    James Silverman

    Executioner / Pirate #1 (voice)

18. 

    Lauren Tom

    Numbuh Three (voice)

19. 

    Billy West

    Pirate #8 / Miniature Cyclops / Spider Clown Mailman / Beast Master (voice)

20. 

    Fred Willard

    The Boogey Man (voice)