Lives in Zac's Garage
Mimmi (biological sister)
In the beginning, Zac is the typical, perhaps just above average teenage boy, growing up on the Gold Coast. He's good looking, gets good grades at school, has a long term girlfriend, parents who let him do what he likes and everyone seems to knows him well. His seemingly perfect life is shattered when he discovers that whenever he comes in contact with water, he grows a merman tail.
Cam, his best friend, is the first person he tells. Cam quickly becomes fascinated with Zac's abilities, but as Zac's ego grows and he starts to view himself as better than everyone else, Cam's interest and motivation to support his friend turns to intense jealousy. This is soon accompanied by intense resentment when the negative aspects of being a merman begin to take their toll on Zac. As it becomes harder for Zac to keep his secret, it becomes harder for Cam to help him, and Zac begins taking his frustration out on him.
When things hit rock bottom with Cam Lyla, Sirena, and Nixie learn of Zac's powers and Zac finds a new support network. It's Lyla that Zac feels most comfortable confiding in, causing problems with his girlfriend, Evie, who breaks up with him. This all changes when Zac discovers not only that Lyla is a mermaid but that she wants to take his amazing new powers. The battlelines are drawn.
Through the second half of season 1, Zac battles with Lyla, Nixie and Sirena for possession of the Trident. During this time, he displayed a great deal of resourcefulness such as in "The Trident Job" where he is able to outsmart the mermaids and gain possession of the trident. Because of this, and the sheer power of the trident, Zac's confrontations with his newly declared nemeses have mostly ended in his victory. However, the mermaids finally succeed in getting the trident from Zac and Lyla is able to hide it.
This defeat for Zac soon proves short-lived. Zac finds the trident where Lyla hid it and they fight for it underwater, resulting in Lyla being knocked unconscious. This turn of events shocks Zac and he realizes his mistake of trying to get the trident. Later learns it will destroy the moon pool forever if it is taken there during a full moon, so he locks it away in the chamber once again after helping Lyla recover. Their friendship restored, Lyla is again the one he confides in the most, but it never goes any further than Lyla possibly would have liked.
Following this, Zac decides to grant the girl's request to give up his powers since it hurts him to have to lie to Evie. At the end of series one, Evie now knows Zac's secret and Cam has betrayed him by attempting to go to the Moon Pool on a full moon with the trident. With his help, the mermaids are able to stop Cam and he breaks the trident. In the aftermath of it all, being in the full moon under a full moon did not remove Zac's powers. Despite his broken friendship with Cam - Zac is relieved he finally can have the mermaids as friends without trouble from Evie, who accepts the girls when she realizes how untrusting she was of them.
In season 2, things seem to be going perfect for Zac at first. Despite losing a friend in Cam, he is now completely happy being a merman since he no longer has to lie to his girlfriend Evie. Soon however, things in his life get complicated upon the arrival of the seventh full moon since Zac became a merman and two new mermaids Ondina and Mimmi. This duo of mermaids intend to finish what Sirena began and they don't plan on giving Zac a choice in the matter. There are also more complications with Zac's growing connection to Mako. This includes his discovery of an ancient Merman Chamber which also attracts Erik's interest. Zac awakens it by moving his hand over a rock with glowing symbols, which include a moonrise, an island, a full moon, the moon pool, and a trident. It becomes apparent that Zac is the only one capable of controlling the chamber and he becomes determined to find out it's purpose and why he is connected to it. Also in this season, Evie becomes a mermaid. At first Zac is eager to help her, even take her out swimming, but the mystery of the chamber and the power growing inside, draws him away from her in the most important situations. Evie becomes anxious as to why he is suddenly seeing visions and having to leave in important situation, but it is revealed that it is not the island at all, but his connection to Mimmi, who is actually his long lost sister. Zac learns that he was actually born a merman and that he is the son of Nerissa, the most powerful mermaid to ever exist. This revelation is all just to much for Zac and he begins pushing those close to him away as a result, overwhelmed by the fact that his whole life has been a lie. Eventually, he learns to accept who he really is after Mimmi reminds him that he has a family who cares for him and they assure him that they always considered him their real son. He then reconciles with all the people he cares about, including Cam and accepts Mimmi as his sister. Following this, the bond between Zac and his newfound sister is shown to have grown very strong throughout the second half of season 2. Both of them are shown to be extremely caring and protective of each other. At some point off screen, Zac and Mimmi take a photograph together which Zac treasures.
Throughout the second half of season 2, Zac's curiosity of the chamber grows and he continues to seek it's purpose, while at the same time wanting to make certain that Mimmi and all mermaids are safe. He later finds out from Rita that he and Mimmi are descendants of the merman that built the chamber and that he refused to activate it after falling in love with a mermaid. This causes Zac to have second thoughts about trying to activate the chamber. He and the others would eventually discover however, that typing in the code is only the first step to starting the chamber and that the trident must be placed within it. Since Zac already destroyed it, all seems well at first until Erik deduces that the stone that acted as the heart of its power is what starts the chamber instead of the trident by itself. After learning from Sirena that she hid the stone at Rita's following the trident's destruction, he accidentally activates it again when he touches it due to his stronger connection to Mako. He resolves to hide it, but this proves harder then expected when the stone urges him to use it and Erik finds out he has it. Despite his best efforts, Erik gets the stone and it robs Zac of his magic allowing him to start the chamber. Now powerless, Zac seemingly loses all hope of stopping Erik, but he musters courage after he is encouraged by Cam, Evie and Mimmi. When Erik activates the chamber and it begins to kill the mermaids, Zac bravely attempts the grab the stone and deactivate it. He is successful, but seemingly at the cost of his own life. Zac's sacrifice proves unbearable for the mermaids and they are all overcome with grief, especially Evie and Mimmi. However, Mimmi is able to use the stone to restore Zac's life and his powers, to everyone's great relief. Zac's heroic actions earn him Veridia's trust and praise and he is made an honorary member of the pod along with Evie. He then greets the pod with the rest of the gang, happy that they no longer fear him and have accepted him as a friend.
Zac is tall, tan, and is very muscular and built. He has dark hair and dark eyes and is said to be very handsome. As a merman, Zac has a long, blue tail to match his regular appearance.
Zac possesses the ability to transform into a merman ten seconds after touching water.
As a merman, he has the ability to swim at super speed of 600km/h, hold his breath for at least 20 minutes, and dive at a depth lower than the deepest divers in the world. After drying, his body reverts back to human form.
In "Dolphin Tale", he starts the ignition on Joe's boat and starts moving it. In "Zac's Return to Mako", when he was under the influence of the Full Moon, Lyla tried to stop him from reaching the land entrance and he pushed her using this power.
After his first Full Moon in "Zac's Return to Mako", he is now able to become invisible like the girls. In "The Siren" Zac turns invisible so Mrs. Santos doesn't see him in her office. In "Truce" and "Nowhere to Hide" he uses this power so he doesn't caught in the cafe and the warehouse.
Zac used this power to improve Cam's and Carly's singing in "Sirena's Secret".
Zac is very fond of Evie and cares very much for her and wants to be a good boyfriend. Their relationship becomes very strained because of Zac hiding his secret from her, and even more when Lyla and Zac become close friends. Evie is the one person he does not want to discover his merman side for fear of losing her. She later finds out to her amazement about his tail when he is forced to save her from drowning in Betrayed. During season 2, they continue to date and grow closer as best friends and as a couple. They grow even more close when Evie accidentally becomes a mermaid after attempting to save him from a new group of mermaids in the town. She continues to support him and offered him emotional support after he found out about his adoption.
Zac and Cam have been best mates from the time they were young children. At first Cam is very supportive of his friend and helps him keep his secret hidden from Evie. Until "Zac's Pool Party" when Cam get tired of covering for him and shoves him into his pool, Zac's secret exposed to the three undercover mermaids. Later, they make up and Cam starts helping Zac to get the trident. Later, Cam grows even more jealous of his friends powers and is outraged when Zac puts the trident back into its chamber. Finally, he schemes to become a merman, but is unsuccesful and in the end is on his own. After Cam helps Zac in season 2 with other oceanic issues, they finally rekindle their friendship, though they aren't as close as they were.
Zac's girlfriend Evie gets jealous of Lyla after seeing them 'cuddling' on the jetty. Lyla and Zac become really close after she and the other two mermaids 'accidentally' discover he is a merman. Zac always feels the most comfortable around Lyla and they form a very close bond. Zac may yet discover he has feelings for her later on. However, since Lyla was not seen for seasons 2 and 3, their friendship is now distant. Lyla ends up moving on with Nixie by joining another pod. For more on their relationship go to - Zac and Lyla
She is Zac's sister. During the seventh cycle Zac began to have visions of Mako Island, and the trident chamber along with Mimmi who is able to see them as well. Rita finally revealed that Zac is Nerissa's son, and Mimmi's brother due to Zac, and Mimmi able to share visions from their bloodline. He couldn't accept Mimmi as his sister or the truth of his bloodline. They share a mind connection unlike noneother as much as Zac denies her as his blood-sister.
The image gallery for Zac may be viewed here. .