The Hollow has a new servant under its wings, and Klaus (Joseph Morgan) and Elijah (Daniel Gillies) work on a plan to expose this being. Meanwhile, Marcel (Charles Michael Davis) might be the cause to one of the Originals' death.

On the next episode of "The Originals" season 4, titled "Bag of Cobras," Klaus and Elijah will try to bring out The Hollow's new servant by having a party and by spying on everyone that appears suspicious.

"When it's discovered that The Hollow has employed a mysterious servant to do its bidding, Klaus and Elijah host an elaborate party in order to lure the new threat out and uncover its identity. Feeling a sense of responsibility for The Hollow's resurgence, Vincent (Yusuf Gatewood) uses his magic to help the Mikaelsons root out this latest threat. Meanwhile, after uncovering information about who may have been behind her parents' death, Hayley (Phoebe Tonkin) turns to Freya (Riley Voelkel) to help unlock her memories from that fateful day," the episode listing on The Futon Critic reads.

As seen from the episode 9 promo, Elijah lets Vincent know that he's done reasoning with The Hollow, which hints that the Mikaelsons will be stepping over the line just to catch its new servant in action.

Meanwhile, Marcel might cause the death of one of the Mikaelsons, and it might possibly be Klaus' life on the line.

Previously on "The Originals" season 4, Dominic (Darri Ingolfsson) has announced that Marcel is the only one who has the power to eliminate an Original forever because of his blood that was offered to The Hollow.

The thorns on the vine that grew on Marcel's blood is the key to killing an Original, and with his heart full of hate for Klaus, he might bring death to his father.

"The Originals" airs every Friday night at 8 p.m. EDT on The CW.