Sabrina agrees to help Maritza with her science project but oversleeps and forgets. At the witches' academy, Sabrina and Cassandra meet a very frank magic mirror who insults and infuriates Cassandra. After class Maritza accidentally slams her failed project onto Cassandra's designer shirt, and as much as tells Sabrina that their friendship is over. When Cassandra hurries off to confront the mirror for its rudeness, Sabrina follows her sensing trouble. Upon seeing Sabrina, the mirror tells her what Cassandra REALLY thinks of her, and in a moment of rage Sabrina casts a spell that sends both girls through the mirror and into an alternate world- where everyone at Greendale High is a witch except for the two of them! All the students mock these former witches, especially Maritza who cruelly casts a spell that sends them flying into the swimming pool to everyone's great amusement. Cassandra is unwilling to work with Sabrina to find a solution and tries instead to reason with her old ...