H2O: Just Add Water

Season 2, Episode 26

Episode Title: Unfathomable

Air Date: 2008-03-21

Overview:

A unusual and rare planetary alingment is set to cause the full moon to remove a mermaids powers if they enter the moon pool! Charlotte shows immunity and tries to reveal the girls secret before Lewis takes her to Mako Island. The girls follow and a battle erupts. But who will win?