Ep 10. Zac Returns to Mako

Zac has returned to Mako Island, but he doesn't remember anything about his past or who he is. He begins to experience strange, uncontrollable powers that he doesn't understand. Meanwhile, the mermaids are trying to figure out what to do with him. They are torn between wanting to help him regain his memories and being wary of the danger that he may pose if he doesn't regain control of his new abilities.

As they try to come up with a plan, they discover that there are others who are after Zac. The mermaids must work together to try to keep him safe and uncover the truth about his past. Along the way, they learn more about the powers of the island and their own abilities.

Zac's presence on the island also causes tension between the mermaids themselves. Lyla, Sirena, and Nixie all have different opinions about what to do with him, which causes conflict within the group. As they navigate their differences, they also have to deal with a new threat: a group of humans who are determined to uncover the secrets of Mako Island.

The episode is full of action, suspense, and mysterious twists and turns. Viewers will be on the edge of their seats as they try to unravel the mystery of Zac's past and his connection to the island. It's a thrilling adventure that will keep audiences engaged from start to finish.