Decision Time

S1 E26: It's a full moon and Nixie doesn't trust Zac to stay away from the Trident. When Cam takes the Trident to Mako behind Nixie's back, the mermaids realise that he intends to turn himself into a merman so he can rule Mako Island. Zac and the mermaids work together to stop Cam, and to destroy the Trident once and for all. There's a new pod in the Mako waters - Zac, Sirena, Lyla and Nixie - a new alliance!