|H2O Just Add Water: Hawaii|
|Number of Seasons:||6|
|Number of Episodes:||165|
H2O Just Add Water: Hawaii is an American Installment in the H2O Just Water Universe and Franchise and sequel to the main Australian TV Series.
Over a 1000 years ago, a merman pod tried to took over Mako Island from the Mako Pod, and initiated a war in order to achieve their purpose. It was by this time that the Trident was created, and the mermen originally planned to use it to destroy and kill any mermaid who appeared in their way. Armies of mermaids from the five oceans battled with them, however, they almost perished until a group of mermen (the ancestors of Zac and Marius) knew what they were doing were wrong, and they betrayed their fellow mermen friends and joined the mermaids in order to stop them. They eventually won the war and the Trident was sealed away in the Trident Cave to prevent a similar situation to happen again. Because of this war, mermen became mermaid's most mortal enemies and they were banished to land by them, giving them to adoption to a foster human family when they were born.
Fast Forward to the year 2020 in Mako Coast City, HI 5 teens discover a Special Sacred Sea Cave that will reveal their true identities. Alexa, Thalassa, Imani, Marius and Mina use their newly acquired gifts to protect the Sea Marine Life from those who plot to pollute and destroy everything that is pure.
- Alexa - a Native Hawaiian and the daughter of Mermaid Alura, member of the Oceania Pod aka Northern Pacific Pod Alexa has the mermaid powers of Bubble Manipulation, Gelidkinesis, and Substanciakinesis . Alexa often acts as a team leader.
- Thalassa - a native from the Northern Pod moved to Mako Coast City for a better life. Her name means The Sea in Greek. Thalassa has the powers of Hydrokinesis, Aerokinesis, and Atmokinesis.
- Imani - Imani is from the newly revived South Eastern Pod. Imani is a native of Kenya a country in Africa. Her name means faith in Swahili. Imani has a strong knowledge of Sea Creatures and can speak their language. Imani has the powers of Hydro-Thermokinesis, Electrokinesis, Pyrokinesis and Zoolingualism
- Marius - the only guy of the five and the merman also the twin brother of Mina. Marius is a few seconds younger than his twin sister. Marius and Mina are the descendants of Eastern Pod Royalty. Marius has the powers of Hydrokinesis, Hydro-Cryokinesis, Cryokinesis, Telepathy and Telekinesis.
- Mina - the smartest one of the five and the twin sister of Marius. Mina is a few seconds older than her twin brother. Marius and Mina are the descendants of Eastern Pod Royalty. Mina has the powers of Hydrokinesis, Hydro-Cryokinesis, Cryokinesis, Telepathy and Telekinesis.