Wizards of Waverly Place
Wizards of Apartment 13B (1) (4x21)
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Alex and Harper decide to move into an apartment together after finding and Ad. They soon learn that the Ad is for a Special, Secret 13th floor and learn it is for Wizard World creatures only. They decide to take the Apartment only to find Mason living there.
Note: This is part 1 of a 4-part arc.