Ruby Gillman, 16, and her family are Krakens in secret and live in the town of Oceanside. Agatha, Ruby's mother, is adamant about her daughter not going anywhere near the ocean, not even to the seaside prom held by her school. Despite being persuaded to ask out her crush, Connor, Ruby is unintentionally knocked into the sea by her pals Margot, Trevin, and Bliss. Although new student Chelsea Van Der Zed steals the credit, Ruby leaps in to save Connor, inadvertently causing an underwater change. Ruby runs away inside the school library, only to have her fingers turned into bioluminescent suction cups. She then turns into a giant kraken. Chelsea and Agatha notice her; Ruby's metamorphosis has called her brother Brill, who lives by the water. Agatha comforts her agitated daughter till she becomes human.
With a reluctant Brill's help, Ruby sneaks into the ocean to meet her grandmother, the Warrior Queen of the Seven Seas, who reveals that Ruby is in line to rule as protector of the ocean. Other creatures have tried to seize power, including Leviathans, Umibōzu, and most dangerous of all, Mermaids. The evil Mermaid Queen Nerissa found the Trident of Oceanus but was defeated by Agatha, who hid the Trident before abandoning her kingdom for a life on land.
Returning home, Ruby is attacked by vengeful sea captain Gordon Lighthouse, but is saved by Chelsea, who is actually a mermaid. Gordon's footage of Ruby in Kraken form goes viral, but Chelsea befriends Ruby, taking her on a "Super Sea Girl Ditch Day". Chelsea suggests that by finding the Trident, they can end the war between Krakens and Mermaids; her mother, Nerissa, was killed trying to recover the Trident from the Well of Seas.
Grandmamah trains her granddaughter to master her Kraken powers, unaware she is using them to practice entering the Well of Seas, and Ruby neglects her friends to spend time with Chelsea. Ruby's father Arthur, younger brother Sam, and Brill trick Gordon into "capturing" their pet sea creature Nessie, letting him believe he has ended the Kraken threat. Ruby tries to introduce Chelsea to her mother, but Agatha is unwilling to trust a Mermaid and forbids her daughter from returning to the ocean, but an angry Ruby transforms and storms off.
Grandmamah tells Agatha that Nerissa never had a daughter.
Ruby finds the Trident, but Chelsea betrays her—it turns out that Chelsea is indeed Nerissa. Nerissa submerges Ruby and uses the Trident to eliminate the Krakens, disrupting prom night while fending off Agatha and Grandmamah. Brill gives Ruby the go-ahead to confront Nerissa and save the prom ship. Gordon captures Nerissa after Ruby, her mother, and grandmother use their combined powers to smash the trident. Ruby's students embrace her as their Kraken hero, and she gets back together with her loved ones. Meanwhile, Connor says yes to her prom invitation, and Agatha and Grandmamah make amends. Ruby and her family had accepted their identity as Krakens some time later, but Ruby and
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