H2O: Just Add Water Double Trouble (2006–2010) Online
- Original Title :
- Double Trouble
- Genre :
- TV Episode / Adventure / Drama / Family / Fantasy
- Year :
- 2006–2010
- Directror :
- Colin Budds,Jeffrey Walker
- Cast :
- Brittany Byrnes,Cariba Heine,Claire Holt
- Writer :
- Simon Butters,Anthony Morris
- Type :
- TV Episode
- Time :
- 25min
- Rating :
- 8.7/10
Lewis falls asleep on the beach and has a nightmare that Cleo is seen in her mermaid form by a group of beach goers. Cleo chaperones Elliot and Kim on a date at the marine park and has to quickly dive into the water when she gets splashed. Lewis has to dive in and cover for her when a crowd of people catch a glimpse of her tail.
| Episode cast overview: | |||
 | Brittany Byrnes | - | Charlotte |
 | Cariba Heine | - | Rikki |
 | Claire Holt | - | Emma |
 | Phoebe Tonkin | - | Cleo |
 | Angus McLaren | - | Lewis |
 | Craig Horner | - | Ash |
 | Trent Sullivan | - | Elliot |
 | Cleo Massey | - | Kim |
 | Shae Mahoney | - | Kid #1 |
| Ryan Sheldrake | - | Kid #2 |
 | Alan David Lee | - | Don Sertori |