that Neri came to Earth on a spaceship with her father when she was young, though his death soon after the ship's crash left Neri to fend for herself. Prior to meeting Jason and Brett, Neri's only friend was a humpback whale (a jali in Neri's native tongue) whom she names "Charlie" and with whom she can communicate. Later in the series, Neri's curiosity leads her to explore ORCA, while Dr. Bates's study of Charlie's whale song helps her identify Neri as the intended recipient of that song. Eventually, Dr Bates and her assistant, Dr. Winston Seth, become embroiled in Jason and Brett's effort to keep Neri a secret, while also performing numerous tests on Neri to understand how she's able to communicate with whales. At the same time that the Bates family learn about Neri, a rival research organisation, the UBRI Corporation, are introduced. Headed by the sinister Dr. Hellegren, UBRI have learned that a spacecraft landed somewhere in the vicinity of ORCA, and begin their own search for any personnel that may have survived. Simultaneously, they work on other projects which threaten the natural ecology of the ocean around ORCA. Eventually, they put in play an effort to build the so-called "ORCA City", an elaborate underwater construction that will likely eradicate much of the natural life on the seabed. In response, Dr. Bates's mission changes over the course of the series from cetologist to environmental protectionist. This role becomes more prominent beginning with the third season, when UBRI representatives establish themselves on board ORCA. Accordingly, the series shifts to a more serious tone in its later seasons. As Neri gradually discovers more of her island and ORCA, she also begins to understand her greater purpose. This self-awakening is particularly enhanced by encounters with others of her kind. In the second season, she discovers her sister, Mera, and the two are given the opportunity to return to their home planet. Mera avails herself of this option, but Neri stays, feeling that she must discover what her father was trying to do on Earth. In the third season, she gains entry into the downed spacecraft that originally brought her to Earth. There, she finds another of her people in suspended animation. The new character, Kal, proves to be the son of the commander of the vessel, and helps her tap into the ship's memory core. She finds the ship's log,