H2O: Just Add Water (2006)
S2E26 Unfathomable
Episode Overview
An extraordinary planetary alignment is about to occur, leading to a full moon that will strip mermaids of their powers if they enter the moon pool. Charlotte proves to be immune and attempts to expose the girls' secret before Lewis escorts her to Mako Island. The girls pursue them, resulting in a fierce confrontation. But who will ultimately emerge victorious?
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S2