In her first week at Griffin Secondary, Gwen realises there's something fishy about Ms. Blatt, the Socials teacher. Tasha suspects that Ms. Blatt is a witch, working a spell to steal youth and beauty from her students.
During a rehearsal for a school production of MacBeth, Gwen starts to see visions of the future. They start coming true. Meanwhile, her pendant goes missing, and Reine develops a crush on Josh.
Michael's father bribes the school so Michael will make the basketball team. However, that is exactly what Michael does not want. Meanwhile, Gwen finds that there is something Magical about Michael.
Gwen manages to get Gadowain to stop following Michael around while invisible, but now he can't leave Tasha's shop and starts eating all of the snacks.
Gwen finds herself isolated as she has broken off with Josh and Tasha is no longer speaking to her. But this is a stronger, more focused Gwen who is now determined to learn magic and save her mom.
Tasha sees Black Angus, an evil dog that dooms everyone who sees it to death. Using a faerie device, Gwen goes back in time to prevent anyone from seeing it.
While studying time capsules left behind by a class long ago, Gwen and Tasha discover find a horrible secret about a teacher who disappeared fifty years go.
Gwen finds her friendship with Michael tested as, under Reine's influence, he falls more and more into the role of de facto leader of a gang of bad boys who are terrorizing the school.
Someone casts a spell and tries to frame Gwen for stealing money. Gwen must find the real culprit and contend with an over-zealous police investigator who thinks she is guilty.
Someone casts a spell on Gwen to prevent her from leaving her foster parents' shop. She must find out who did it, why they did it, and how to stop them.
Spencer accidentally sells his emotions for complete knowledge of the secrets of the universe. Gwen must get them back. Meanwhile, Michael has disappeared.
Intent on saving Merlin, Gwen enters Faerie and succeeds in going back to Merlin's time. Tapping into her former life as Guinevere, she remembers the secret of how to find Merlin's Stone.
Having used Merlin's Stone to save Karen, Gwen attempts to return the crystal to Merlin's time through Faerie, but O'Leary intervenes and gives the crystal to Morgana.
As humanity wallows under Morgana's tyranny, Gwen organizes Tasha, Josh, Spencer, Harve, Louise and Katie - all of whom are unaware that the world was ever different - into a resistance.