When Sabrina's bitter math teacher Mr. Rothwell singles her out for unfair treatment, and her aunts are unable to make him see reason, the witchly trio decide it's time to teach him a few of their own spellbinding lessons. When he's hauled into traffic court, they replace the human judge with a magical substitute who's been hibernating in a deep freeze "to prevent media bias." Meanwhile, Salem panics when his ex-girlfriend decides to pay him a surprise visit -- especially since she has no idea that he has been turned into a cat.