Betrayal

S1 E13: The full moon is once again upon Mako. The all-powerful trident is on Zac's mind, and that of the mermaids. If they don't stop him, Zac could gain unimaginable power and be dangerous to all mermaids. Lyla thinks they just need to keep him out of the moonlight, but Nixie doesn't see an end to it. They should let Zac get the Trident, then take it from him while he's under the moon's spell. They can then hide it or find a way to destroy it. But they don't really know the full power of the Trident. Zac doesn't want to be near the Trident, not when he's under moonspell, with no self-control. Feeling he can trust Lyla, he asks her to help him stay out of the moonlight that night. Evie, seeing Zac and Lyla together at the café, knows that Zac is lying to her and breaks up with him. Cam offers to help Zac during the night and finds out Zac has told Lyla, Nixie and Sirena about his merman powers. How can Zac trust the three girls, and not him? Especially when no one knows anything about the girls. Feeling Cam is picking a fight, Zac asks him to leave. As the moon rises Zac does his best to fight its pull. With Lyla's help, he just might control it, but Nixie thinks it's futile and pulls open a curtain. Under moonspell, an uncontrollable Zac torpedoes to Mako. In the depths of the island, he reaches the Trident Chamber, closely shadowed by the three mermaids who follow him into the water. In a moment of triumph, Zac seizes the Trident... and turns to see the mermaids in their true form. As Lyla tries to seize the Trident, a burst of power throws them all out of the water chamber, and the Trident is locked back in its resting place. Zac is deeply wounded by the mermaids' betrayal. He trusted them! He confides in Cam - the girls are mermaids. When he held the Trident his mind was clear, he is meant to have his merman powers, and the Trident. He believes the mermaids want the Trident's power for themselves.