Max and Phoebe advance to the final tryout for a spot on an elite superhero squad, but a new super villain with a surprise connection to the Thunderman family may force them to sacrifice their crime fighting dream.
Max must finally make a choice between fighting for good or evil when the Villain League threatens to halt Phoebe's superhero ascension and destroy the Thundermans.
Tired of hearing tales of Hiddenville's legendary mayor, the kids use a time machine to travel back 60 years to disprove the myths; but when they inadvertently alter the past, the effect is disastrous for their hometown.
When one of Max's old pranks threatens to ruin a superhero gathering, Phoebe and Max are unable to stop it even with their combined powers, which leads Phoebe to make a life-changing decision.
The Thundermans are forced to relocate to another city after their secret is revealed. However, when a new threat rises in Hiddenville, Phoebe and Max risk everything in order to save Hiddenville.
Sparks fly between Phoebe and Cherry's visiting brother, prompting Cherry to grow concerned that she will be overshadowed by this new romance; after Cherry begs Phoebe not to date her brother, Phoebe must decide between love and friendship.