Hold onto your capes and get ready for a Super September, as Phoebe, Max and Chloe are set to return in brand new episodes of The Thundermans: Undercover on Wednesday, September 10, only on Nickelodeon!
The latest new episodes of The Thundermans: Undercover will bring sky-high stakes, street-level takedowns, and super surprises that no bunny saw coming, including a romance between Max and Phoebe's BFF, Cherry, and Dr. Colosso back in human form, plus, someone's father is harboring a BIG super villainy secret!
In addition to the new episodes, a new hour-long (or two part) special titled "The Mastermind Unmasked" has been revealed! Warning: The following contains MAJOR spoilers!:
The Mastermind Unmasked: Part 1: Max and Phoebe discover that Lazlo Chance may be the evil Mastermind and enlist Chloe to help. B.C. is back from France and is transferring to Chloe's school. The twins ask her to steal B.C.'s ring to get into Lazlo Chance's office to discover the truth about the Mastermind. Chloe steals the ring but feels incredibly guilty and hides it from her siblings. B.C. invites Chloe and her friends to his yacht for a party and to catch up. The twins discover the ring in the house and call in their parents for help, and Billy tags along. They ground Chloe's powers and take her back to Hiddenville. The twins enter Lazlo Chance's office and discover that Lazlo is not the true Mastermind and has been mind-controlled. Chloe runs away to B.C.'s yacht to confront him about his dad. B.C. reveals to Chloe that he's the true Mastermind behind it all, and if she doesn't listen to him, he is going to hurt her friends.
The Mastermind Unmasked: Part 2: B.C. forces Chloe to steal a magical amulet hidden in a cave underneath Hiddenshores that grants him the power to steal other superheroes' powers. Trying to protect her friends, Chloe obtains it for him, only for him to reveal her he turned her friends evil anyway. Max and Phoebe discover it's really B.C. who is the evil master mind. Hank, Barb, and Billy return to let them know Chloe ran away. B.C. sends a drone filled with laughing gas to stop the Thundemands from coming after him, they manage to escape. Max, Phoebe, Billy, and Chloe steal a part of the amulet back, and Mastermind goes after them. In order for Chloe to save her friends, she has to reveal her secret identity to them. Chloe teleports herself and the twins back to the cave to return the crystal from the magical amulet. Mastermind follows them, and as he is not a true superhero, the cave refuses to let him have it and captures him, allowing them to take B.C. to the Hero League.
The Thundermans: Undercover is a brand-new spinoff series based on characters from the original live-action show. The half-hour series follows Phoebe and Max as they are sent undercover to handle a new threat in the beachside town of Secret Shores and bring Chloe along to develop her superhero talent. The Thundermans: Undercover made its debut on Nickelodeon on Wednesday, January 22.
The Thundermans: Undercover stars original series cast members Kira Kosarin as “Phoebe,” Jack Griffo as “Max,” and Maya Le Clark as “Chloe.” The show also stars Daran Norris as “Thunderford,” and Dana Snyder as the voice of “Dr. Colosso,” as well as new cast members Kinley Cunningham as “Booch” and Nathan Broxton as “Jinx.”
The series also features guest appearances from original series cast members including: Chris Tallman as “Hank,” Rosa Blasi as “Barb,” Diego Velazquez as “Billy,” Addison Riecke as “Nora,” Audrey Whitby as “Cherry,” Kenny Ridwan as “Gideon,” Helen Hong as “Mrs. Wong,” Jeff Meachum as “Principal Bradford” and Daniele Gaither as “Super President Kickbutt.” Other guest stars include Ryan Ochoa, Jessica Marie Garcia, Lilimar and Anna McNulty.
The Thunder continues in Clash of the Thundermans, a brand new movie set to premiere on Nickelodeon and Paramount+ in 2026!
In Clash of the Thundermans, when Chloe develops a destructive new superpower, the Hero League orders her to an elite boarding school for superheroes to learn control of her abilities. Faced with the prospect of sending Chloe away for years, the Thundermans split apart, with Phoebe, Barb and Billy taking her into hiding. Max, Hank, and Nora track their rogue family members, until the two factions face off against each other in a full-on battle for the Thundermans’ future.
The film will star the core cast of The Thundermans, along with Ariel Winter (Modern Family, Sofia the First), who will play Cognita.
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Originally published: August 16, 2025.
