H2O: Mermaid Adventures is a Netflix original programme for children. It is based on the Australian teenage show H2O: Just Add Water created by Jonathan M. Shiff. The series is produced by Denis Olivieri and directed by Tian Xiao Zhang. A 13-episode first series was released to Netflix on 22 May 2015. The second half of the series was released on Netflix on 15 July 2015.