Young Teenager Zac decides to camp out on mako island without knowing three mermaids Lyla, Sirena and Nixie are watching him. On the night of the full moon Zac comes into contact with the magical water of the moon pool which causes him to obtain a tail and powers making him a half-mermen. The mermaids need to obtain legs to stop Zac. The Mermaid Pod Are forced to leave. Leaving The Mermaids Behind.