Returning to New Orleans, Niklaus "Klaus" Mikaelson vows to reclaim what once was his: the power, the city and his family.

Rebekah arrives in New Orleans at Elijah's insistence.

Betrayal at a masquerade ball? Klaus and Rebekah join up.

Rebekah is on a mission for information involving Elijah.

Sophie reveals to Klaus and Rebekah a troubling secret.

Cami turns to Father Kieran for guidance.

Marcel makes Rebekah an enticing offer, leaving her torn.

Marcel uncovers upsetting information involving Klaus.

The human faction takes matters into their own hands.

Rebekah enlists the help of someone from Marcel's past.

The entire French Quarter is affected as Davina becomes ill.

Cami comforts Marcel, who shares some details of his past.

Father Kieran finds himself in trouble.

Rebekah's past catches up with her.

Secret details of Rebekah and Marcel are seen in flashback.

Elijah reveals a long-held secret from the family's past.

Elijah makes a move to take matters into his own hands.

Violence explodes at the Feast of the Blessings.

Hayley learns a piece of her family history from Marcel.

Klaus has nightmares of his father.

Marcel rallies an army to take down the Mikaelsons.

In a desperate move, Klaus makes a heartbreaking decision.

Klaus enlists Elijah and Marcel's help.

Mikael grows antsy under Davina's control.

New witch Lenore tries to help with Esther.

Davina takes Mikael to her family cabin.

Elijah is forced to relive a time long ago when he loved a young woman named Tatia.

Esther reveals dark secrets from Klaus' past.

Kaleb shares bits of his past with Davina.

Rebekah finds herself on the run when she realises Esther has uncovered her whereabouts.

Klaus and Hayley reunite with baby Hope.

Vincent is on the loose and wants revenge.

Marcel remembers his days as a solider during World War I.

Jackson shares a secret with Hayley.

Elijah finds himself in the fight of his life.

Cami makes a startling revelation involving baby Hope

Can Elijah and Klaus trust Freya?

Flashbacks with Freya provide insight.

Hayley learns a startling revelation about her future.

Dahlia arrives in New Orleans.

Dahlia gives Klaus and Hayley a deadline.

Vincent approaches Davina with an intriguing offer.

Hayley and Jackson try to escape.

The Mikaelson siblings prepare for the fight of their lives.

An old vampire friend of Klaus' arrives in New Orleans.

Hayley fails to show up during the full moon.

Cami finds herself face to face with Lucien.

Klaus and Lucien form a tentative alliance.

Klaus's past comes back to haunt him.

The Strix makes their move.

A Thanksgiving gathering is an attempt to negotiate a truce.

Klaus must engage in one of Aurora's games.

Hayley attempts a quiet Christmas with Hope.

A risky plan leads to a tense showdown with the Strix.

Elijah reluctantly aligns with Aya.

Klaus lands in a tense standoff with an unlikely foe.

A vengeful Aurora makes her move.

Freya enlists the help of Stefan Salvatore.

A vampire with a vendetta arrives in town.

Rumours begin to spread about the remaining white oak bullet.

Elijah and Finn travel to Mystic Falls.

As the city celebrates Jazz Fest, Klaus is taken hostage.

It's a race to save Cami as her life hangs in the balance.

Klaus and Lucien have an unexpected showdown.

Klaus and Elijah confront Marcel after a plan goes awry.

The Mikaelson siblings finally come face to face with the one person who could lead to their ultimate demise.

Unsired vampires threaten Marcel's rule.

The Mikaelson siblings join Hayley in rescuing Klaus.

Klaus attempts to reconnect with his daughter, Hope.

Hayley turns to Marcel to save her daughter.

Klaus and Marcel show the symptoms of a malevolent haunting.

Klaus and Elijah host a party to lure out a new threat.

The Hollow's latest servant is on the loose.

Hayley and Klaus come face to face with Davina.

The Hollow sends a terrifying message to Vincent.

Klaus wants his estranged siblings to stand against The Hollow.

Freya, Rebekah and Klaus try to destroy The Hollow's power.

The Hollow targets the most vulnerable Mikaelson.

The Mikaelsons are out of options.

Hope tries to bring her father back to New Orleans.

Hope looks forward to possibly seeing her father again.

Elijah awakens without a clue as to who he is.

Frustrated by the search for Hayley, Klaus takes hostages.

A clue sent to Klaus leads him closer to finding Hayley.

Hope sets off on a dangerous mission.

Ivy reveals startling news to Klaus.

The Mikaelson siblings must escape a "chambre de chasse".

The supernatural factions have a deadly showdown.

Klaus helps Hope cope with her pain.

Klaus turns to Davina for help with Hope's affliction.

With Hope fading quickly, Klaus seeks help from Caroline.

Klaus' plan changes the lives of the Mikaelson family.