Ocean Girl

Ocean Girl was an Australian children's show that ran from 1994 to 1998. In the United Kingdom it was called Ocean Odyssey. Created by Jonathan M Shiff, and set in the near future, it focuses on an unusual girl named Neri who lives alone on an island, and the friendships she develops with the inhabitants of an underwater research facility called ORCA (Oceanic Research Centre of Australia).

Over the course of four seasons, she and her friends discovered her past and her role in protecting Earth.

This series contains examples of:

 * Adults Are Useless: The good ones, anyway. Even the ones who know about Neri are generally not in the loop about her 'missions' and when they are they rarely get get to do anything apart from plan.
 * Annoying Younger Sibling: Brett to Jason, originally. He grows out of it. Cass to Morgan, until Morgan vanishes without trace.
 * As You Know: Neri had a habit of repeating several times whatever the current mission was. Possibly justified, as her English wasn't very good.
 * Big Bad: A scientist spent three seasons chasing Neri
 * Chuck Cunningham Syndrome: None of the secondary kids on ORCA survive more than two series. The first couple of times, it's handwaved by having someone say they've been reassigned, but after that it passes without notice.
 * Black and Nerdy - Froggy, also the resident kid genius.
 * Cool Teacher: Dave, in Season 3.
 * Disappeared Dad: Jason and Brett's parents divorced just before the first series. Brett is fairly sanguine about this. Jason, not so much.
 * Does Not Like Shoes: Neri, Mera and Kal all go barefoot. The first few times Neri went to ORCA the kids made her wear shoes, which she hated. By season four she was barefoot even when horse riding. Mera was happy enough in shoes, being raised in the Australian foster care system, but generally went barefoot on the island. Kal never wore shoes.
 * Fun With Acronyms
 * Green Aesop
 * I Choose to Stay:
 * Little Miss Snarker: Cass, Brett's friend in Seasons 3 and 4, is this.
 * The Men in Black: The main antagonists for Season 4 are PRAXIS, a whole organization of MIBs.
 * Mooks: UBRI keeps their mooks in blindingly white lifeguard swimsuits. PRAXIS is a whole organisation of MIBs.
 * Nature Hero: Neri lives on a deserted island and talks to whales. Well, whale.
 * Nobody Can Die: Bad guys either do a heel face turn or are captured and put in prison. Good guys might be injured, but the closest anyone has come to dying is
 * Parental Abandonment: Unintentional.
 * Jason and Brett's father is completely absent until Season 4 - they occasionally mention the divorce, but he himself only appears in Season 4.
 * Quicksand Sucks: Brett gets caught in a 1st season episode.
 * Royals Who Actually Do Something:
 * Sea Stories: Each season had a little time on land, usually in pursuit of the season's MacGuffin, but the majority of time was spent either on Neri's island or on the ORCA station.
 * She Cleans Up Nicely: Neri is invited to a dance on ORCA. Jason is astonished that she actually looks pretty.
 * The Bully: Vanessa, to start with. She's overcompensating because she's tall and smart so people often make fun of her. Later, Mick. He's just a jerk, but as the son of the base commander he can get away with it. Both have heel face turns when faced with Neri.
 * The Other Darrin: Dr Bates' actress switched randomly between seasons 2 and 3.
 * What the Hell Is That Accent: Neri's actress was born in Poland and moved to Australia at the age of four. Neri's accent was - definitely not Australian. Kal also had an odd accent.
 * Wild Child: Neri's father died when she was still very young, and she mostly raised herself. Her whale friend, Charley, helped a bit.
 * You No Take Candle: Neri spoke like this when Jason and Brett first met her, as she'd grown to her teens without actually meeting anyone who spoke English. She learned as the series went on and by Season 4 this was barely in evidence at all.
 * The Bully: Vanessa, to start with. She's overcompensating because she's tall and smart so people often make fun of her. Later, Mick. He's just a jerk, but as the son of the base commander he can get away with it. Both have heel face turns when faced with Neri.
 * The Other Darrin: Dr Bates' actress switched randomly between seasons 2 and 3.
 * What the Hell Is That Accent: Neri's actress was born in Poland and moved to Australia at the age of four. Neri's accent was - definitely not Australian. Kal also had an odd accent.
 * Wild Child: Neri's father died when she was still very young, and she mostly raised herself. Her whale friend, Charley, helped a bit.
 * You No Take Candle: Neri spoke like this when Jason and Brett first met her, as she'd grown to her teens without actually meeting anyone who spoke English. She learned as the series went on and by Season 4 this was barely in evidence at all.