Phoebe and Max Thunderman, twin siblings, set out on a quest to neutralize a looming danger in the coastal town of Secret Shores. They also aim to nurture Chloe’s superhero skills by including her in their covert operation. During this adventure, Chloe befriends two schoolmates who are unaware of her hidden abilities, as they delve into mysterious happenings at their school. As the situation becomes more perilous, the Thunderman siblings are compelled to remain in the town indefinitely, with the bickering twins taking on the responsibility of looking after their younger sister.