Sabrina, tired with Libby's constant teasing, turns her into a nerd to show her what it feels like to be picked on. But instead of learning a lesson, Libby shows her true colors and takes over the Science Club, making them into a group of jerky teens who look down on everyone else (just like her old cheerleading squad). To solve the problem, Sabrina uses a similar spell to turn the whole student body into nerds, keeping Libby from enjoying her prestigious position.

After Salem stows away in her backpack and gets her thrown out of the local pizzeria, Sabrina washes her hands of the cat, feigning unconcern when the feline fails to return for Christmas dinner with visiting cousin Monty. When she discovers that Salem has in fact been catnapped by a stubborn little boy named Rex, Sabrina launches a desperate plan to rescue him by impersonating Santa Claus.