Great tv show from 2006. H2o - Season 1 is by far one of the best online tv shows I've ever watched. It's probably the most known Adventure tv show and it's really entertaining. Remember, no matter what, you have to watch H2o - Season 1 online. Great actors and great story. However, I think that well-chosen actors and an interesting script are not pushed to the background by music, because a good tv show consists of many elements. I hope you're excited, so start watching it now!.