Twins Phoebe and Max are enjoying their superhero lifestyle, but when one 'save' goes awry, the Thundermans are sent back to Hiddenville. While Hank and Barb enjoy their return, and Billy and Nora look forward to a normal high school life, Max and Phoebe are determined to regain their superhero status.

When phone-less and ride-less eleven year old Sonny gets invited to the Shapiro twins’ party, he embarks on a journey through Venice Beach, enlisting help from its locals to get to the event that will surely change his young life.