Madeline attempts to stop the theft of the Mona Lisa in the Louvre, but no one believes her; so, she is sent to a finishing school in London. But now the thieves are also in London, and they will try to rob the Crown Jewels! Would Madeline be able to stop them?
| Actor | Role |
|---|---|
 Whoopi GoldbergMiss Clavel (voice) | Miss Clavel (voice) |
 Chantal StrandMadeline (voice) | Madeline (voice) |
 Jim ByrnesNot listed | Not listed |
 Mackenzie GrayMr. Henry (voice) | Mr. Henry (voice) |
 Britt IrvinDanielle (voice) | Danielle (voice) |
 French TicknerLord Cucuface (voice) | Lord Cucuface (voice) |
 Annick ObonsawinEmma (voice) | Emma (voice) |
 Shannon Chan-KentChloe (voice) | Chloe (voice) |
 Christopher GazeNarrator (voice) | Narrator (voice) |
 Marilyn LightstoneMiss Higginsbottom (voice) | Miss Higginsbottom (voice) |
| JJessie YoungNicole (voice) | Nicole (voice) |
 Jane MortifeeLady Bovina Ribsby (voice) | Lady Bovina Ribsby (voice) |
| FFiroozeh ScottGeneveive | Geneveive |
| CCaroline ChanSue Lee | Sue Lee |