"Wizards vs. Werewolves" is the sixtieth episode overall and the ninth episode of the third season in Wizards of Waverly Place.
In this episode, Justin and Max continue to search for Juliet. Meanwhile, Mason and Alex continue dating and Mason gives her a glowing necklace. However, Mason keeps running away from Alex before the evening. She becomes suspicious and follows him one night. Alex and Harper discover that Mason is actually a werewolf. She confesses that she is a wizard and they continue to date. Mason then reveals that the necklace only glows when someone is in love with the person who put it on the other person. When Justin and Max find out that Mason is a werewolf, Justin thinks that Mason can help track down Juliet. He tracks her scent to Transylvania, where the mummy has been holding Juliet prisoner and expecting Justin, though they destroy the mummy after a brief face-off.
The Russo's happiness at saving Juliet is cut short when it is discovered that Juliet and Mason dated one another three centuries ago, and the situation worsens when Mason impulsively blurts out that he still loves her. Alex throws away the True Love Necklace and breaks up with Mason. Juliet then says that she used to love Mason, but her soulmate is Justin. Alex is heartbroken the next day, and Mason goes to the substation to talk to Alex, but she won't let him explain, and Harper decides to set up an "Alex-watch" to keep the two separate. Later, Mason meets Max, who manages to take him to Alex. Mason is able to persuade Alex to go back to Transylvania with him to search for the True Love Necklace, so that Mason can prove his feelings for her. Justin, Max, and Juliet follow them. At odds with Justin, Mason transforms into a full Werewolf and starts to attack Justin, which results in being attacked by Juliet. During the fight, Juliet bites Mason and is scratched by him in turn: as a result, Juliet loses her vampire powers and quickly ages into a white-haired, wrinkly old lady, and Mason transforms into an actual wolf. Before this happens, however, Alex successfully locates the necklace and puts it on Mason, which proves that he does indeed love her. Realizing that they can no longer be together, Juliet and Mason reluctantly break up with Justin and Alex. They then depart, leaving both Russos completely heartbroken.
- Werewolves, mummies and vampires (which are three monsters)
- True Love Necklace: Glows when someone loves the person who put it on that person
- Gregg Sulkin as Mason Greyback, Bridgit Mendler as Juliet Van Heusen, John Eric Bentley as Mummy, Bryce Hurless as British Kid Wizard
- This is a one-hour special. This was the first episode of Wizards of Waverly Place to be rated TV-PG in the United States for disturbing images and for it being too intense for a Wizards episode, this is the first Disney Channel special since the Lizzie McGuire special "Night of The Day of the Dead" to be rated TV-PG. When Disney Channel decided to re-air all episodes, this episode was rated TV-G.