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Brothers Johnny and Scotty find Sigmund, a sea monster, on the beach and bring him home to their clubhouse. They become fast friends, but when a monster hunter, Capt. Barnabas, finds out, the kids have to scramble to keep Sigmund hidden. Worse still, Sigmund's brothers Blurp and Slurp don't like humans. Against all odds, can they still have an endless summer of fun?

Still separated by circumstance, Sigmund and the kids set out to find one another and continue their friendship. But between Sigmund's overprotective family and Captain Barnabus, who's still determined to prove sea monsters are real, will they ever manage to safely reunite?

The kids teach Sigmund about calling "dibs" and he mistakenly thinks he can take anything he wants from around town as long as he calls "dibs." When Sigmund's stash of "dibs-eds" goods is found at the restaurant, the kids struggle to fix the misunderstanding and return the items without telling anyone that Sigmund exists.

When Robyn gives her mother Maxine a birthday present made by Sigmund, Maxine assumes that Robyn made it and is amazed by Robyn's artistic talent. Not wanting to disappoint her mother, Robyn goes along with the misunderstanding, which snowballs out of control. Meanwhile, Barnabus recruits a reluctant Johnny to help him plan a birthday surprise for Maxine.

After watching a monster movie, Johnny and Scotty decide to recruit Sigmund to make a monster movie of their own. Robyn helps Maxine run a support group to cure Barnabus of his sea monster obsession.

Sigmund volunteers to help Johnny and Robyn win the annual sand castle contest. But when Sigmund gets sick in the process, the kids have to figure out how to cure an ill sea monster. Meanwhile, Scotty brings a robotic vacuum to clean their cave, and Slurp thinks it's a pet his mother has finally gotten for him.

The kids learn that Maxine may have to close the Tater Tower and they're determined to find a way to raise money so they can keep it open and stay in Dead Man's Cove with their best friend, Sigmund. At the same time, Barnabus makes a startling discovery that may change how he feels about sea monsters.