| Episode credited cast: |
 | Jeff Bennett | - | Lucky Bob (voice) |
 | Julie Bernstein | - | Histeria Kid Chorus (voice) |
 | Steven Bernstein | - | Histeria Kid Chorus (voice) |
 | Jim Cummings | - | Narrator / Worm / Taz (voice) |
| Elizabeth Lamers | - | Histeria Kid Chorus (voice) |
 | Tress MacNeille | - | World's Oldest Woman (voice) |
 | Chris Marquette | - | Histeria Kid Chorus (voice) |
 | Laraine Newman | - | Miss Information (voice) |
| Cody Ruegger | - | Loud Kiddington (voice) |
| Luke Ruegger | - | Big Fat Baby (voice) |
| Nate Ruegger | - | Froggo (voice) (as Nathan Ruegger) |
 | Paul Rugg | - | Montezuma (voice) |
 | Cree Summer | - | Mrs. T-Rex (voice) |
 | Frank Welker | - | Father Time (voice) |
 | Billy West | - | Mr. Stegasaurus (voice) |
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