The Fairly OddParents (2001)

S5E26 What's the Difference?

Timmy is engrossed in a find-it book when Mark Chang appears in his usual alien form. His changer is malfunctioning, putting him at risk of being discovered by Mandie. In a frantic attempt to help Mark, Timmy wishes for the school to mimic the world of his book. However, Mandie is on the verge of obliterating the school if Mark doesn’t reveal himself. If only Cosmo and Wanda had their wands, Timmy could simply wish her away. But the whereabouts of the wands remain a mystery.