The series tells the story of Fishtronaut, a fish in a spacesuit, similar to reverse scuba gear, which allows him to fly and breathe out of water. He is a secret agent of Secret Environmental Agency who, along with his friends Marina and Zeek, unravel the mysteries occurring in the Smiling Trees Park. They solve the mysteries with the help of a P.O.P. (Primary Objective Pod), a magical multicolored ball containing clues vital to the mission.
What adults often take for granted in life's minutiae frequently delights children. One of those kids is Luna, 6, for whom the world is a giant laboratory, filled with opportunities to learn more about what things are, and why and how scientific actions take place. Luna's passion for science prompts her exploration of the world with energy and enthusiasm. Little brother Jupiter and pet ferret Clive are by her side as the inquisitive girl pursues answers to her specific questions.
