After a super-villain escapes Ghost World on Halloween, the Thundermans head to New Orleans to join forces with the Hathaways and the Prestons to defeat the ghoul. However, saving the day gets complicated when super-powered trick-or-treating, sibling jealousy and teen romance get in the way.

The crossover starts on The Thundermans S02E05 Haunted Thundermans Part 1 (I).