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 Hollow's 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 centuries-old evil with them, it becomes clear that the closing chapter of this family saga will be as bloody and emotional as ever.

Dr. Denman has discovered the girls' powers and traps them at the Moon Pool. Zane proves where his loyalties lie when he finds out, but as Denman won't forget about the girls, their only hope seems to lie in the coming night's lunar eclipse, which will take away their powers…

Rikki, Emma and Cleo discover that sea turtles are being captured by fishing nets. When Rikki and Emma attempt to rescue the turtles by cutting the nets, it causes the fisherman to think that there is a rogue shark roaming their ocean.

The full moon has come again, and the girls are taking every precaution they can imagine this time. It proves to be in vain, however, when Rikki falls under the spell.

Rikki gains an admirer in Emma's younger brother Elliot when she saves him from drowning. She lets him down hard causing him to run away and hide in the fernery. The girls find him just as the watering system is about to start…

Sophie uses Bella‟s idea for a fundraising concert and presents it as her own to Rikki to gain publicity for the cafe. Cleo's caught in the crossfire with Kim when Samantha moves in and puts her stamp on the Sertori home.

Will seeks confirmation of his first experience on Mako Island. Bella volunteers to misdirect his search so he won‟t find the Moon Pool. The girls and Lewis discover the Moon Pool has changed.

Kim attempts to derail Don and Samantha's wedding. Lewis receives an opportunity to study in America. Cleo realises she's got to let Lewis live his own life and let him go overseas.

Will pushes himself too far when Zane challenges him to prove his skills as a free-diver. The girls discover a unique crystal in the rock from the Moon Pool.

Don gets a second job at the Marine Park on the Pirate ship and outshines Cleo, threatening the future of her Dolphin show. Bella and Will find difficulty trying to connect with each others' interests.