The future of the Mikaelson siblings is on the line in the next episode of "The Originals" season 3.

For the upcoming episode of "The Originals" titled "You Hung the Moon," Elijah (Daniel Gillies) and Jackson (Nathan Parson) will become extra worried about Hayley's (Phoebe Tonkin) welfare when she fails to appear during the full moon. This is after they find out that the poachers are starting to capture the werewolves in the bayou.

But Davina (Danielle Campbell) knows exactly where Hayley is since she was the one who captured her during the premiere episode, and will use that knowledge to her advantage.

Since both Davina and Hayley have deep anger for Klaus (Joseph Morgan), they will conspire and become allies to defeat their common enemy. However, Hayley must do something first for Davina before she lets her see her daughter Hope.

But before the two plot their revenge against Klaus, the most hated Mikaelson family member will first share some tender moments with Cami (Leah Pipes). The two will talk about Cami's theory regarding the rampant deaths that are happening at the French Quarter, and they will try to find out if it is true. Klaus will also dig deeper to find out the authenticity of the future threat revealed in the prophecy about the Mikaelsons.

In the promo trailer for the episode, Klaus is seen talking on the phone and giving a warning to the person on the other end of the line. "You listen carefully, the next gruesome murder will be yours," Klaus said.

The official synopsis for "The Originals" episode that will air on Thursday, Oct. 15, reads:

"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 (Andrew Lees) 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."