Question: when does chris find out mimi is a mermaid
Answer: Special guest star : Cariba Heine as Rikki Chadwick 68 16 `` Homecoming '' John Hartley Mark Shirrefs 28 August 2016 ( 2016 - 08 - 28 ) 27 May 2016 This episode 's plot summary may be too long or excessively detailed .