Guest Stars Dominic Deutscher as Cam Rowan Hills as David Kerith Atkinson as Rita Santos Brooke Nichole Lee as Carly Natalie O'Donnell as Veridia Reiko Austen as Senior Mermaid #1 Natalie Prigoone as Senior Mermaid #2 Anita Munro as Younger Mermaid #1 Yasmin Honeychurch as Younger Mermaid #2 Angourie Rice as Neptuna "Neppy" Hemi Rudolph as Gavin's Mate #2 Ricardo Pritchard as Gavin Nick Everard as Gavin's Mate #1
