May 27, 2016 (Netflix)
August 28, 2016 (Eleven)
- Zac plans on telling his adoptive parents about Nerissa, and therefore the fact he's a merman.
- Mimmi shows Chris that she is a mermaid the same way that Sirena showed David and Emma showing Ash.
- Rikki is considering bringing her friends back to Mako to meet the pod.
- Weilan is given a Moon Ring and decided to move back to Shanghai to find the Eastern pod.
- Ondina decides to join her for a little while before returning.
- Ondina - Isabel Durant
- Mimmi - Allie Bertram
- Weilan - Linda Ngo
- Zac Blakely - Chai Romruen
- Evie McLaren - Gemma Forsyth
- Cam Mitchell - Dominic Deutscher
- Carly Morgan - Brooke Nichole Lee
- David - Rowan Hills
- Chris - Taylor Glockner
- Veridia - Natalie O'Donnell
- Nerissa - Tasneem Roc
- Mr. Singh - Alex Pinder
- Uncle Shen - Jon-Claire Lee
- Mermaid Council Member #1 - Jessica Stafford
- Mermaid Council Member #2 - Jacqueline Tan
- Art Centre Worker #1 - Lincoln Raurimu
- Art Centre Worker #2 - Luke Frohling
- Rita Santos - Kerith Atkinson
- Rikki Chadwick - Cariba Heine