Alex Russo brings a mischievous and exceptionally powerful student, Billie, to her brother Justin's home in the hopes of coaxing him out of retirement to teach her.
Billie's use of magic outside of the lair gets her in trouble with Justin, and her fear of being kicked out of yet another home bubbles to the surface.
On her first day of school, Billie uses magic to impress Roman's best friend. But when a jealous Roman steals Billie's wand, he falls into the grasp of a wizard-hunting phantomus!
On Halloween, Billie tells Roman about Pumpkin Belly, a ghoul who eats anyone whose house isn't spookily decorated. Meanwhile, Justin, Milo & Giada defend the home from pranksters.
Billie and Justin must work together to undo a spell when Billie's prank goes awry. Roman gains muscles thanks to a magical muscle tee. Milo's class pet gets loose in the house.
When Billie uses a spell on her BadgerBook profile and accidentally enchants her classmates, she must find a way to break it to get everyone back to normal!
Billie gets wizard help to finish her homework and meets a member of the Russo family. Justin runs into an old mentor while Billie uses magic on Roman's Homecoming parade float.
When Billie struggles with a spell, Roman says he could do it if he was a wizard. To prove him wrong, Billie uses a Power Glass to transfer her powers to Roman.
When Billie uses a potion to enter Justin's mind, she discovers what really happened during the infamous "Unicorn Incident" that got him fired from WizTech.
Billie, Roman and Winter sneak into the Wizard World so Billie can compete in an underground magic battle: Battle of the Wands. Meanwhile, Milo covers for the kids at home.
When Billie's neighbor, Bella Bianchi, sees her using magic, Billie and Milo try to convince her it is fake ... until their efforts result in Bella getting stuck in the lair.
Billie sets off to complete a wizard quest on her 13th birthday, believing that Justin organized it. However, the quest is a test from someone with more nefarious intentions.
When Billie can't join Roman and Winter's team for a robotics competition, she enlists Milo and uses magic to design an over-the-top robot of their own with disastrous results.
After finding out about the prophecy, Billie avoids using magic, but when a magical creature causes mayhem in the Russo house, Billie worries it's somehow still her fault.
