Angry when Zelda allows mean Mr. Kraft to stay in their home while his grandmother's home undergoes renovations, Sabrina and Hilda bring back Mr. Kraft's ex-wife, Lucy, not knowing that she too is a witch.
Sabrina's aunts send in their magic for its annual overhaul, but when it is sent back, it ends up in the hands of three pirate prisoners they forgot to release years before, and Sabrina, also without magic due to a mishap, must save them.
Sabrina receives a C on her English story and Zelda suggests she use a manual typewriter to help her out. The typewriter turns out to be magic and the characters from Sabrina's spy-story come to life and they're all clones of Harvey, Libby, Mr Kraft, Mrs Quick and Valerie. Hilda & Zelda receive Other Realm chain-letters and are bombarded with strange enchantments.
When Sabrina's evil vice principal, who is also Zelda's boyfriend, comes over for dinner, Sabrina and Hilda put "silent spells" on themselves to keep them from saying anything rude. Except, as Sabrina is later told by their talking black cat, Salem, when two silent spells are cast in the same household at the same time, the house becomes a silent movie.
Sabrina learns that she has been instructed to mentor a witch student, and it turns out that her student is the new girl at school, Dreama. However, Dreama's clumsy spells arouse Harvey's friend Brad's suspicions, revealing his true nature.
Feeling lonely without Valerie around, Sabrina gradually becomes more and more jealous of Harvey and Brad's close friendship, and as her deep envy builds, she develops a serious condition called jealitosis.
Much to Hilda and Zelda's displeasure, their mother pays the family a visit. It seems as though it will be as tense an affair as usual, until Sabrina discovers a set of papers which reveal a surprising family secret.
After being approved for her first credit card, Sabrina becomes obsessed with buying as many items as possible, and is soon at risk of developing getitis, a condition which makes the sufferer literally become spoiled rotten.
After a short job search, Sabrina is hired as a barista at the local coffee house. However, her decision to work on Halloween is not popular with her aunts, and their ominous prediction that Sabrina cannot escape from Halloween proves true.
As her crush on Josh intensifies, Sabrina is torn between helping him study for an exam and watching Harvey's football game. Desperate, she enlists Dreama's help, while Hilda and Zilda's search for a housekeeper leads to a surprise reunion.
In order to impress Josh, Sabrina begins using oil of old age, which makes her more mature. However, she does not use it sparingly, and it soon makes her turn older and older, while Hilda's magic clock produces Marie and Pierre Curie.
Sabrina is finding it difficult to deal with Harvey's romance with Colette, and despite Dreama's best efforts, they seem unlikely to reconcile. Meanwhile, Hilda and Zelda decide to make Thanksgiving dinner, and zap in two pilgrims to help.
Sabrina and Mrs. Quick uncover a scandal at school involving Mr. Kraft and misappropriated funds. Meanwhile, Sabrina finds Salem a date for his high school reunion, but it seems he is much more interested in her than she is in him.