

Animation•
Family•
Kids•
The Best Episodes of H2O: Mermaid Adventures Season 1
Every episode of H2O: Mermaid Adventures Season 1 ranked from best to worst. Discover the Best Episodes of H2O: Mermaid Adventures Season 1!

Animation•
Family•
Kids•
The Best Episodes of H2O: Mermaid Adventures Season 1
Every episode of H2O: Mermaid Adventures Season 1 ranked from best to worst. Discover the Best Episodes of H2O: Mermaid Adventures Season 1!
The lives of teenagers Emma, Cleo and Rikki are forever changed when a magical, forbidden island gives them the power to turn into mermaids.
Seasons2
Season 1 Ratings Summary
"The Secret of Mako Island" is the best rated episode of "H2O: Mermaid Adventures" season 1. It scored 7.4/10 based on 23 votes. Directed by Unknown and written by Unknown, it aired on 6/1/2015. This episode is rated 0.3 points higher than the second-best, "Caught in the Net".