The full moon returns and thus the trident will be within Zac's reach. Lyla is desperate to prevent Zac from grabbing the trident and harming, or even killing, himself. Cam confronts Zac when he realises that Zac is putting too much trust in three mysterious girls who have no background. When Zac is unsuccessful at fighting the full moon, he races to Mako Island to grab the trident, with the girls following pursuit. Zac reaches the trident and turns, seeing the girls in their mermaid form. Lyla fights with Zac and accidentally causes the trident to activate and throw everyone out of the entrance. Zac has snapped out of the moon's spell but is angry that the girls have been lying to him from the beginning. Believing that the girls are trying to take the trident for themselves, Zac ends their friendship. After apologising to Cam, Zac is now even more determined to get the trident.