Max and Phoebe bring Chloe on an undercover mission to Secret Shores so she can experience life as a normal kid. When a new supervillain threat emerges, the trio must stay in town longer than they anticipated.

After a training accident causes a glitch in Chloe's powers, Max and Phoebe look for a cure. After Max thinks he's solved the issue, he allows Chloe to attend a party with friends, but his treatment creates brand new powers Chloe can't control.

Chloe, Jinx, and Booch are designing a new school mascot, but Max and Phoebe's fighting ruins the project. After Chloe expresses her anger toward her siblings, they realize their twin-fighting impacts Chloe in new ways now that they're guardians.

After Phoebe and Max let Chloe's friends watch a horror movie and eat candy, Jinx and Booch's parents want to meet Chloe's. With Hank and Barb away, Max and Phoebe transform into them to help Chloe. It goes well until the real Hank and Barb show up.

Max bets Phoebe she can't turn off being a superhero and go on a normal date. Chloe helps Phoebe do well on the date, but Max tries to sabotage it by crying wolf. Suddenly, a real supervillain emerges and puts Max and Chloe in serious danger.

Cherry visits, and the Thundermans discover she still has her superpowers. Cherry promises to remove them after her girls' day with Phoebe and Chloe, but the powers malfunction and puts the group in danger. Max hosts Jinx, making Colosso jealous.

A new super-fast villain is wreaking havoc in Secret Shores, and Billy is the only hope at tracking her down. After Billy's speed accidentally triggers an avalanche, however, he decides to hang up his cape and retire from being a superhero.

The spin off revolves around Phoebe, Max, and Chloe, who are tasked with investigating a new threat in the town of Secret Shores. While on this mission, they aim to nurture Chloe's superhero abilities.

The Thundermans are visited by High Tide, the former protector of Secret Shores. But when they explain to him that they are the new superheroes in town, he decides to take back his old role, even if it puts Jinx and Booch in danger.

Max seeks help dealing with a mystery prankster at school from his old principal, who was always the target of his pranks. But Max fails to stop the pranks and quits the mission, prompting Chloe to confess that she was the prankster all along.

Chloe is struggling with her leadership skills, but when a villain attacks her school field trip, Max and Phoebe have to put Chloe in charge while they try to take down the villain and defuse his dangerous astronomical weapon.

Missing fame and fans, Max decides to recapture some glory by breaking Booch's sandwich-stacking record at Splat by the Sea, but Chloe challenges him so that her friend can have her record back.

Chloe must attend summer school, and Max is assigned to be her teacher. While they will be busy all summer, Phoebe decides to go solo on missions. She meets a new superhero named Captain Perfect, and discovers they make a good crime-fighting team.

Max learns that Phoebe is working with Captain Perfect, and sets out to uncover the secret he is keeping. Chloe's crush invites her to a product launch party at Splat By The Sea, at the same time Jinx and Booch want her to protest outside the party.

Upset that Phoebe has a new partner, Max decides to partner with his friend Gideon. But things backfire when Max tries to turn Gideon into a supersized superhero. Chloe's friends pretend to be wealthy so they can bond with her new crush.

Max agrees to mentor Captain Perfect's younger sister, who is headed down the path of becoming a supervillain. But he has his hands full when she tries to become one of Mastermind's henchmen. Phoebe tries to help BC ask Chloe to the school dance.

Mrs. Wong visits Secret Shores, and threatens to reveal the Thundermans' superhero identities to the town. But Max and Phoebe's plan to have Dr. Colosso keep her quiet backfires in ways they could not have imagined.

With Cherry working at Splat by Sea, Max ropes her into a fake dating scheme to score partner discounts at the restaurant. Chloe faces a tough choice between winning a trivia competition or supporting her brother Billy when he wants to join her team.

After Chloe's birthday party is cancelled, Max and Phoebe compete to throw her a new one. When Max's time-stopping birthday gift falls into the wrong hands, he must work with Phoebe to stop some party poopers from ruining Chloe's birthday.

Phoebe and Max tell holiday stories to compete in the Thundermans Story Slam, but it's Chloe's story that makes them understand the meaning of the holiday.

When B.C. forces Chloe to steal a magical amulet that grants him superhero powers, the Thundermans unite to stop his plan. Chloe must reveal her identity to save her friends.