The Ultimate Book of Spells - Season 1 - Eps 19: Dark Image
Cassy and Gus make fun of Verne for being a mortie. He gets mad and leaves. He goes to the mortie arcade. He has a magical artifact in his backpack. It turns Verne into a powerful dark wizard. Later it Cassy into a powerful dark sorceress. It's up to Gus to stop them from destroying the earth and each other!
About The Ultimate Book of Spells

Title: The Ultimate Book of Spells
First Air Date: 2001-09-12
Last Air Date: 2001-12-05
Status: Canceled
Rating: 6.5/10 (from 2 votes)
Language: EN
Seasons: 1
Total Episodes: 26
Network: CBBC YTV Toon Disney
Genres: Animation, Sci-Fi & Fantasy, Family, Kids
Production Companies: BKN International
Synopsis
Inspired by the popular Harry Potter book and movie series, the show presents a trio of "wizards-in-training" at an enchanted private school run by Miss Crystalgazer. Cassy is a junior witch, Gus is a half-elf/half-human junior wizard, and Verne is a promising "mortie", i.e. a non-magical human. With the guidance of the talking Ultimate Book of Spells (aka UBOS), the three have to battle the evil wizard Zarlak, who's trying to steal all of the world's spells.
Cast

Ron Halder
UBOS (voice)

Janyse Jaud
Cassy (voice)

Cathy Weseluck
Vern (voice)

Michael Dobson
Prince Erbert / Snap the Dragon (voice)