|Season 1, Episode 13|
|Air date||October, 18 2013|
|Written by||Michael Joshua|
|Directed by||Evan Clarry|
Betrayal is the thirteenth episode of Season 1 of Mako Mermaids and was made available on Netflix on July 26 2013.
With the arrival of the full moon, the girls must keep Zac from returning to Mako Island and getting the Trident. Evie calls it off with Zac after seeing him and Lyla together at the café and Cam's friendship is tested when he realizes Zac has told the girls his secret. Nixie, believing Zac should be allowed to obtain the trident so they can take it from him, puts her controversial plan into action and exposes Zac to moon light. Compelled to return to Mako Island by the Moon Spell, Zac enters the portal to retrieve the trident. He is followed by the girls but when both Zac and Lyla grab the trident, everyone is thrown back out through the portal. With the girls' deception revealed, Zac vows he will get the power he believes he was meant to have while the girls are determined to get the trident despite having lost Zac's trust.
- Lucy Fry as Lyla
- Amy Ruffle as Sirena
- Ivy Latimer as Nixie
- Chai Romruen as Zac Blakely
- Dominic Deutscher as Cam
- Gemma Forsyth as Evie
- Brooke Nichole Lee as Carly
- Kerith Atkinson as Rita Santos
- I Just Wanna Be (Theme song)
- Across the Sea (Sirena)
- In this episode Zac discovers that girls are mermaids.
- Evie break ups with Zac.
- Zac is not friends with mermaids anymore.
- This episode starts with Sirena singing.
- It probably means that Zac finds out that the girls betrayed him.
Lyla: What do you think you're doing?
Sirena: Aquata and I always sing that dong the night of the full moon.
Zac: I'm a bit nervous about tonight
Lyla: You should be.Promise me you'll be careful.You mustn't go to Mako.
Zac: You sound like you know something.
Evie: Hey yourself.
Zac: Are you okay?