When three normal teenage girls stumble upon an ancient cavern they undergo a transformation that will change their lives forever. H20 - just add water, sees three very different girls facing everyday teen problems with a twist - they're mermaids with incredible powers over water.

The final season begins seven years after the core members of the Mikaelson family, Klaus, Elijah, Rebekah and Kol, each absorb a quarter of the Hollow2s dark energy and flee New Orleans to keep their beloved city and young Hope safe. As the Mickaelsons return to New Orleans, bringing the pieces of a century2s old evil with them, it becomes clear that the closing chapter of this family saga will be as bloody and emotional as ever.