Cove, Marina, a young mermaid with a thirst for adventure, finds an opportunity to earn pearls by babysitting a group of lively baby jellyfish. Eager to buy a book filled with oceanic tales, Marina accepts the job, supported by her cautious but loyal friend, Coral the seahorse. Together, they embark on a day filled with fun, learning, and unexpected challenges as they care for the playful jellyfish.

The baby jellyfish, brimming with curiosity and energy, lead Marina and Coral through a series of adventures across the coral reefs. From exploring hidden nooks to engaging in joyful games, each moment is a chance for Marina and Coral to demonstrate their creativity, patience, and leadership. The day takes an anxious turn when one baby jellyfish, lured by a shiny pebble, strays into danger. Marina and Coral's quick thinking and bravery guide them in rescuing the lost jellyfish, teaching the group the importance of sticking together and listening.

As the day draws to a close, the baby jellyfish's mother, Jellina, returns to find her little ones safe and sound, thanks to Marina and Coral's diligent care. Grateful, Jellina rewards them with pearls, enabling Marina to purchase her desired book. More importantly, Marina and Coral discover the joy and satisfaction that come from helping others, the bonds forged through responsibility, and the lessons learned in the face of adventure.

Marina and the Jellyfish Jamboree is a heartwarming story of friendship, responsibility, and the adventure that caring for others can bring. Through their underwater escapades, Marina and Coral not only learn about the sea's wonders but also the value of patience, teamwork, and the profound impact of kindness.