Tension between Marcel and Klaus results in Marcel refusing to help Klaus with a gruesome discovery in the Cauldron. Rebekah revisits her past when she finds the remnants of a sacrifice by the docks - the work of a dangerous warlock she has come across before. Klaus battles, but his opponent has an unfair advantage.
Marcel and Rebekah fret over whether secrets hidden for nearly a century are about to be exposed. Father Kieran deals with a witch from his past. Hayley and her werewolf clan enjoy a party. Sophie discovers something shocking at the cemetery. Klaus takes some dangerous measures that will affect everybody.
Genevieve asks Elijah to allow her coven to publicly celebrate a traditional feast day, where members of the community offer the witches gifts in return for blessings. Meanwhile, Elijah makes plans to restore his home to its former glory; and Klaus sends Cary, a werewolf from his own line, to find a missing piece of family history.
Kieran lashes out unexpectedly after Cami's good intentions don't get her what she expected. Elijah and Klaus can't agree on how to handle the Crescent Wolves. Elijah visits the bayou were he is witness to a explosion that see's hatred between the communities intensify. Hayley learns about her family from Marcel.
Klaus's family has yet to forgive Klaus's actions. Klaus's old friend decides to show up and show him Chaos. While Elijah tries to hunt werewolves down to protect Hayley leaving Freya on nanny duty. Meanwhile Marcel's has organized another vampire community, while Davina is learning to control the coven as their leader only to find it's not as easy as it looks and seeks help from Hayley.
After discovering that poachers have begun taking out werewolves in the bayou, Elijah and Jackson grow concerned for Hayley's safety when she fails to show up during the full moon. Meanwhile, Davina, the only one with the answer to Hayley's whereabouts, plots ways to use that to her advantage. Elsewhere, Cami approaches Klaus with her theory on who is behind the series of murders in the French Quarter, while Lucien delivers to Elijah an unsettling warning about the war brewing among the sire lines. Finally, after receiving a dire prophecy about the future of the Mikaelson siblings, Klaus takes extreme measures to determine the validity of this potential impending threat.
When Elijah and Freya realize that Rebekah may be the target of The Strix's latest plan, they do whatever it takes to protect her. Klaus spends time with Aurora to figure out where her loyalties lie, while a dangerous run-in with a member of The Strix leads Hayley and Marcel to make an unsettling discovery.
After learning that Cami's life is in danger and Aurora may be to blame, Klaus is forced to engage in another one of her devious games and follows a series of clues she's left behind for him. Meanwhile, Elijah, Freya and Hayley take drastic measures against Tristan when they discover he holds a valuable piece of information they need. Elsewhere, Aya gives Marcel an ultimatum that leaves him with a difficult decision to make, while tensions between Hayley and Jackson cause her to reevaluate her involvement in Mikaelson family matters.
When a dangerous affliction threatens to expose one of her siblings, Freya searches for a way to reverse the crippling curse even as she finds herself the target of The Strix's latest plan. Elsewhere, Klaus keeps a watchful eye over Cami while she attempts to help Detective Kinney, whose life has begun to spiral out of control as a result of Lucien's compulsion. Meanwhile, a confrontation with Marcel causes Vincent to reevaluate his decision to stay out of witch business, and Hayley's attempt at a quiet Christmas with Jackson and Hope results in an unexpected surprise.
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. Meanwhile, Kol is forced to face his brother Finn, the person responsible for his death; and Klaus and Hayley seek shelter with her former pack and stumble upon some unsettling news.
When its discovered that Freya has been kidnapped and is in the hands of a dangerous new threat, the Mikaelson brothers are forced to put aside their differences in order to save her before it’s too late. Following a lead that brings them to Mystic Falls, Elijah and Finn run into deputy Matt Donovan, who does not take well to new vampires in his town. Meanwhile, Klaus and Hayley work together to uncover the motive behind one of Lucien’s secret agendas, while a troubling shift in Kol’s behavior leaves Davina concerned for their future together.
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. Meanwhile, when Kol’s erratic behavior worsens, Davina has no choice but to turn to Marcel and Vincent for help.
In the wake of a ruthless plan that has left their family shattered, Klaus, Elijah and Freya desperately search for a way to take down Lucien once and for all. However, their efforts are put on hold following an urgent plea for help from Kol and Marcel. At Klaus’ insistence, Freya and Elijah reluctantly stay behind to offer their help, while Klaus and Hayley head to the bayou after uncovering Lucien’s latest plan. Once there, an unexpected showdown between Klaus and Lucien forces Freya to take matters into her own hands, setting off a chain of events that will change all of their lives forever.
After receiving new visions of the looming prophecy, Freya uncovers that her family is on a collision course with a dangerous new enemy. Meanwhile, with the help of Detective Kinney, Vincent and Kol travel to the ancestral world to put a stop to the witches and take back their city once and for all. Elsewhere, Klaus and Elijah confront Marcel after a heartbreaking plan gone wrong has sent him spiraling.
After months of thwarting off dangerous threats and deadly attacks, the Mikaelson siblings finally come face to face with the one person that could lead to their ultimate demise. With the stakes higher than ever and the compound overrun by an army of his oldest sworn enemies, Klaus is put on trial for centuries of atrocities he’s committed. Meanwhile, Marcel, who has been spiraling out of control following an act of betrayal by those closest to him, is stunned by the unexpected arrival of someone from his past. Finally, Elijah, Freya and Kol frantically search for a way to save their family before it’s too late.
When a mysterious disappearance brings Klaus back to New Orleans, Hope looks forward to the prospect of seeing her father again. However, when the dark magic that had been keeping them apart begins to manifest in dangerous ways across the city, Vincent turns to Ivy for guidance about what it may mean. Elsewhere, Marcel returns to New Orleans amidst increased tensions between the supernatural factions, while Freya makes a decision about her future with Keelin. Finally, Roman’s surprise visit to the Mikaelson compound forces Hope to reveal some dark truths about her family.
In the immediate aftermath of having his memory erased by Marcel, Elijah awakens to find himself in the middle of nowhere and without a clue as to who he is. Unable to control his instinctive vampire ways, Elijah encounters Antoinette, a beautiful and free-spirited vampire, who helps him navigate his new life. However, a run-in with Klaus threatens to destroy the peace he’s finally found.
Frustrated by the lack of progress made in the search for Hayley, Klaus turns up the heat by taking hostages from each of the three New Orleans supernatural factions. Freya goes to Mystic Falls to check on Hope, who has been sent back to the Salvatore School. Vincent seeks guidance from Ivy after learning that Klaus’ erratic behavior is escalating.
Klaus turns to Davina for help to learn more about a mysterious affliction affecting Hope. On their wedding day, Freya and Keelin make a tough decision about their future together, while Elijah is forced to confront a past memory of Hayley. Finally, Declan’s growing curiosity in the city’s supernatural secrets forces Marcel to step in.
With Hope facing a life-threatening affliction and deteriorating quickly, Klaus travels to Mystic Falls to seek help from Caroline. Tasked with keeping Hope preoccupied in Mystic Falls, Elijah comes to a heartbreaking realization about his niece. Meanwhile, at the Salvatore School for the Young and Gifted, a run-in with Alaric Saltzman throws a wrench into Klaus’ plan.