As Sabrina and her aunts get ready for their daily activities, they get a surprise when sunspots cause molecular instability in the Mortal Realm. After Zelda's arm gets attached to Hilda's body and a black hole forms in the kitchen sink, the aunts warn Sabrina to be careful while at school since they don't know how she'll react to the sunspots. At first, Sabrina has mild reactions when dealing with the molecular instability, but when she bumps into Libby, the two girls swap personalities with Sabrina becoming far meaner and more self-centered than Libby, while Libby becomes perkier and sweeter than Sabrina.
The first one to notice the change in Sabrina is Salem, when he finds her studying the self-centered spells in the magic book. To make matters worse, he suggests to her to take over the world, resulting in Sabrina being arrested by the Witches Council where she is set to be turned into a familiar.
Meanwhile, Hilda tries to impress a violin trio in order to secure herself a spot but the molecular instability in the house and then the Other Realm police storming in from the linen closet ruin her chances.
- Melissa Joan Hart as Sabrina Spellman
- Nick Bakay as Salem Saberhagen
- Caroline Rhea as Hilda Spellman
- Beth Broderick as Zelda Spellman
- Nate Richert as Harvey Kinkle
- Jenna Leigh Green as Libby Chessler
- Lindsay Sloane as Valerie Birkhead
- Martin Mull as Willard Kraft
- Henry Gibson as Witch Judge
- Cee Cee Harshaw as Cee Cee
- Bridget Flanery as Jill
Uses of Magic
- Sabrina conjures a giant fish for Salem.
- Zelda turns on the witch channel.
- Zelda conjures the magic book.
- Sabrina's hairstyle changes.
- Hilda sinks into the couch.
- Sabrina and Libby swap personalities. Later, Zelda bumps them together to switch them back.
- Sabrina makes the captain of the football team grovel at her feet and then, sends him away.
- Sabrina transfers the cheerleader's canned goods to the science club.
- Sabrina changes her B- to an A+.
- Sabrina makes Libby drop her tray.
- Sabrina changes her burger into a shrimp cocktail.
- Sabrina pulls Mr. Kraft's pants down.
- Sabrina jams the library door.
- A black hole appears in the sink.
- The front door disappears.
- Salem's head goes through the door.
- The Quizmaster does not appear in this episode.
- This is Henry Gibson's second appearance as Judge Samuels, previously appearing in the Season One episode"Trial by Fury."
- Jill and CeCe reveal that the cheerleaders have always liked Sabrina. but they were frightened of Libby. This may fit into the idea Zelda said in the previous episode that Libby picks on Sabrina as she is jealous of her, so this is maybe why Libby is mean to her as she sees Sabrina as her rival.
- Zelda Spellman attempts to reverse the effects of the molecular instability by announcing an incantation in what is supposed to be Latin before Hilda reminds her that mortals are present. "Latin" spell casting would be used again by Duke in Season Four.