The parents of a baby dolphin have died because of barrels of toxic waste dumped in the sea. He is taken in at the station, and Marlene decides to name the clever little fellow Einstein. Einstein quickly wins everyone's hearts and soon becomes a full-fledged member of the Misty Island family. Meanwhile, Jesse and Willy are busy solving the case of the toxic waste dumps. They soon discover that the crooked Machine is behind it once again.