8.526 / 26 H2O: Mermaid Adventures Jun. 01, 2015 H2O: Mermaid Adventures IMDb: 8.5 2015 5974 views Watch H2O: Mermaid Adventures full episode online free kisscartoon. Storyline: When three normal teenage girls stumble upon an ancient cave they ... AdventureAnimationComedyFamilyKids