Many night creatures have noticed strange beams of light that are mysteriously appearing and disappearing in the Park. All the Mommy turtles are getting pretty worried about the eggs they buried in the sand as the beams of light could confuse the babies once they hatch and they might not be able to find their way to the sea.
Fishtronaut and Marina go to their friend, the stingray's, birthday party. She's sad because a lot of her friends didn't show up. A POP appears bringing clues: a white board and a garden hose. Fishtronaut, Marina, Zeek, along with Agent Rosy's help, discover that many of the reefs have been bleached and are partially covered by all sorts of trash. As a result, the underwater dwellers who lived off the reefs have had to move elsewhere. Their mission will be to restore the coral reefs. Fishtronaut, Marina, and Zeek build an underwater nursery to raise coral and reestablish the underwater equilibrium.