When did The Thundermans: Undercover Season 1 Episode 21 air?
The Thundermans: Undercover Season 1 Episode 21 aired on September 17, 2025.


Twins Phoebe and Max Thunderman embark on a mission to alleviate the threat in the seaside town of Secret Shores, as well as helping Chloe develop her superhero abilities by bringing her along on their undercover mission. Chloe forms a bond with two classmates while they investigate suspicious activity coming from the local school, who don’t realize their new friend has secret powers. As the danger increases, the Thunderman trio must stay in town indefinitely, leaving the squabbling twins in charge of raising their younger sister.

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.
Direct answers for episode-level questions and details.
The Thundermans: Undercover Season 1 Episode 21 aired on September 17, 2025.
This episode runs for approximately 22 minutes.
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