Teddy and Ivy plan on attending a Halloween party, but the two must take Charlie out for trick-or-treating, their plans are soon derailed when Karl plays a cruel prank on Charlie and he ruins Teddy's costume. Teddy and Ivy decide to get revenge on Karl for ruining their Halloween. Teddy dresses up as a more scarier version of Mary and she begins to threaten Karl for his immature behavior, she immediately succeeds at scaring Karl and he runs away in terror. Meanwhile, Gabe is forced to do whatever Mrs. Dabney says after her house is trashed by some pranksters. PJ dresses goth in order to impress his new girlfriend Zoey.