Hayley atempts to save her unborn baby from the witches. Francesca meets with Oliver and Jackson to decide the future of the werewolves in New Orleans.

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.

Cami feels threatened, as Marcel rallies an army to take back control of the city.

Intent on saving Hope's life, Klaus' plan will change the lives of the Mikaelson family forever.

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.

With the threat of the prophecy looming over their heads, Klaus and Elijah 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. Elsewhere, Freya leads the charge to get her brothers back and enlists the help of Marcel, Hayley and Stefan Salvatore, an old friend of Klaus', whose unexpected arrival may be the key to their survival. Finally, Davina moves forward with a dangerous plan that brings her one step closer to reuniting with Kol. The crossover starts on The Vampire Diaries S7E14 Moonlight on the Bayou (I).

Following a violent encounter that has left Cami’s life hanging in the balance, Klaus is forced to rely on his family and allies to find a cure as he keeps a watchful eye over Cami 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. Elsewhere, Hayley and Elijah travel to the bayou in hopes of bringing back a potential antidote that could save Cami’s life. Finally, Davina confronts Lucien and learns some heartbreaking information that will change her future with Kol forever.

Since the original vampires were stuck in the cemetery, Klaus takes any chances to punish his sister with the Original-killer stake.

When it's 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.

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.

In the war between Klaus and Marcel, Rebecca stands against her own brother Klaus. The chemistry between Elijah and Hayley gets stronger. Klaus accuses his siblings of distrust and betrayal.

Davina becomes violently ill and the repercussions affect the entire French Quarter. Sophie delivers some startling information about the harvest festival and presents a drastic plan to save Davina. Hayley, racked with guilt, confesses to Elijah about her role in Sophie's plan.

In 1919, Rebekah worked in a sanatorium. She finds herself back there and locked up as a witch who is seeking revenge plans to reveal her darkest secrets. Elijah makes a decision that puts the others in further danger.

Rebekah and Marcel have been trying to keep a secret from Klaus which may come to the light as we flashback to 1919. Elijah and Monique bond. Hayley takes Sabine hostage to try and get information on reversing the curse on her clan.

In the aftermath of a horrific plan that left Cami dead, Klaus declares war on Aurora and Tristan. Elsewhere, Vincent, who has resumed his role as Regent to the New Orleans witches, is forced to use his magic against his will, while Hayley and Jackson ind themselves pawns in Tristan’s twisted game. Finally, after learning that Tristan is in possession of a powerful weapon that could take their family down once and for all, Klaus, Elijah and Freya enact a risky plan that leads to a tense showdown with The Strix.

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.

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.

Klaus becomes angry over recent events involving the safety of his unborn baby and demands answers from Sophie. Meanwhile, gruesome remains are discovered in the bayou; and Davina reveals some shocking information about the witches.

Klaus goes to extreme measures to protect Hayley and their unborn baby when he learns Hayley's life is being threatened. Meanwhile, Cami turns to Father Kieran for guidance. Marcel seeks advice from an old friend. Davina tries to control her magic.

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.

Vincent joins forces with a figure from his past. Kaleb is forced to make a difficult life or death decision, and Elijah finds himself in the fight of his life. Hayley and Jackson become pawns in Vincent's dangerous plan.

Betrayal at the masquerade ball? Klaus and Rebekah come together to attempt to unravel Marcel's empire from within, in spite of Elijah's concerns. They enlist help from Sophie.

Hayley goes missing after someone from her past makes a startling revelation. Klaus has a dangerous encounter with an unexpected visitor. Davina makes a surprising connection. Marcel makes Rebekah an enticing offer that leaves her torn.

Locals prepare to celebrate the annual Casket Girls Festival in the French Quarter. Davina tries to free Cami from Klaus's mind compulsion. Hayley is forced to make a difficult decision after she receives an unexpected phone call.