In this two-part special episode, the Thundermans' plans to enjoy a relaxing family vacation in Hawaii are put on hold when Phoebe becomes infected and possessed by the evil powers of Dark Mayhem (previously used by her to avert a crisis at the annual superhero awards ceremony due to one of Max's old evil pranks). As a result, she becomes evil and obsessed with world nomination. In a desperate race against time to save thousands of lives (especially Phoebe herself), the rest of the family spring into action to thwart this diabolical plot.
—Anonymous