Season 3 begins with Klaus becoming suspicious when an old vampire friend arrives in New Orleans with a mysterious agenda involving the Mikaelson's remaining sire lines. Meanwhile, Hayley struggles with being cursed to her wolf form in the bayou.

Elijah and Jackson grow concerned for Hayley's safety when she fails to show up during the full moon. Meanwhile, Cami approaches Klaus with her theory on who is behind the series of murders in the French Quarter; Lucien delivers to Elijah an unsettling warning about the war brewing among the sire lines.

Klaus and Elijah come together to uncover Lucien's true motives in New Orleans; Lucien reveals some unexpected information about his past with Klaus; a mysterious figure presents an enticing offer to Marcel; Hayley turns to an unconventional way of coping with her current situation.

Elijah attends a gala thrown by a group of ancient vampires known as the Strix in order to uncover what Tristan is really up to in New Orleans. At the gala, Marcel is approached with an enticing offer from a mysterious woman. Meanwhile, Klaus and Lucien form a tentative alliance when a vital component of Lucien's plan goes missing and they must find it.

Klaus' past comes back to haunt him when he receives an unexpected visit; Elijah suspects Tristan is hiding something; Davina struggles with her role as Regent and seeks advice from Hayley; the Mikaelson brothers are threatened by an ancient secret that is uncovered.

Elijah and Freya try to protect Rebekah from the Strix; Klaus spends time with Aurora to determine where her loyalties lie; Hayley and Marcel make an unsettling discovery when they have a dangerous encounter with a member of the Strix; Lucien creates an elaborate scheme that forces Cami to make a difficult decision and leaves Det. Kinney to fight for his life.

Klaus and Elijah invite Lucien, Tristan and Aurora to a Thanksgiving gathering in an attempt to negotiate a truce. But when Aurora reveals she has powerful leverage over Klaus, Hayley and Freya take matters into their own hands, leading to a deadly three-way confrontation.

Cami's life is in danger, which forces Klaus to engage in one of Aurora's devious games and follow a series of clues she leaves behind. Meanwhile, Elijah, Freya and Hayley take drastic measures against Tristan when they discover he holds a valuable piece of information they need.

A dangerous affliction threatens to expose one of Freya's siblings, so she searches for a way to reverse the crippling curse; Cami tries to help Det. Kinney, whose life is spiraling out of control as a result of Lucien's compulsion; Vincent rethinks his decision to stay out of the witch business; Hayley gets an unexpected surprise.

Klaus declares war on Aurora and Tristan, in the aftermath of a horrific plan that left Cami dead. Meanwhile, Vincent is forced to use his magic against his will; and a risky plan leads to a showdown between the Strix and Klaus, Elijah and Freya.

Elijah reluctantly aligns with Aya after learning she may have knowledge of an elusive weapon that could kill an original vampire for good. Meanwhile, Davina is conflicted after she is approached with an enticing offer that could bring her one step closer to reuniting with Kol.

Klaus faces an unlikely foe when a powerful weapon that could take down the Mikaelsons for good ends up in the wrong hands. Meanwhile, Elijah's attempt to reclaim control of The Strix leads to a violent showdown and the emergence of a potential new leader. Elsewhere, a new coven of witches tries to get Davina to help them locate the elusive weapon.

Aurora uses Freya as bait to lure Klaus and Elijah into a dangerous trap. Meanwhile, Davina is recruited by the Strix's coven of witches to perform a spell that could save the lives of her closest friends, and she conjures up Kol to help her; Hayley is forced to make a heartbreaking sacrifice.

The threat of the prophecy looms over Klaus and Elijah, who find themselves rendered useless inside a magical trap, while Aya and the Strix's coven of witches move forward with a risky spell that could take one of them down for good.

Klaus faces a new threat when a vampire with a vendetta against him arrives in New Orleans and puts the lives of innocent people in danger. The situation leads Vincent to help the vengeful vampire in his plan to take down Klaus.

Dangerous foes descend upon New Orleans in an attempt to take down Klaus once and for all when rumors spread about the remaining white oak bullet. As the threats grow, Elijah urges his siblings to lay low at the compound while Marcel, Vincent and Josh chase down a lead involving a mysterious vampire named Sofya.

Freya is kidnapped and is in the hands of a dangerous new threat, which causes Elijah and Finn to visit Mystic Falls where they run into deputy dumbass Matt Donovan who does not take well to new vampires being in town.

As the city celebrates its annual Jazz Fest, an unlikely team of Mikaelson foes joins forces to take Klaus hostage. Leading the charge to get their brother back, Elijah and Freya face off against a powerful force like none they've ever seen before, while Hayley and Cami set their own risky plan in motion to rescue Klaus.

Cami's life is in danger, and Klaus is forced to rely on his family and allies to find a cure as he takes care of her at the compound. With time running out, Freya turns to her arsenal of spells, while Vincent and Marcel head to Cami's apartment to gather a crucial ingredient.

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Klaus, Elijah and Freya search for a way to take down Lucien once and for all, and the result is a showdown between Klaus and Lucien that forces Freya to take matters into her own hands. A chain of events follows that forever changes all of their lives.

Freya receives new visions of the looming prophecy and learns her family is on a collision course with a dangerous new enemy. Meanwhile, Vincent and Kol travel to the ancestral world to stop the witches and take back their city for good. Elsewhere, Klaus and Elijah confront Marcel after a heartbreaking plan goes awry and sends him spiraling.

Season 3 ends with Klaus being put on trial for centuries of atrocities he's committed. Meanwhile, Marcel is stunned by the unexpected arrival of someone from his past; and Elijah, Freya and Kol frantically search for a way to save their family before it's too late.