The next all-new episode of "The Originals" will be intense as Mikael Mikaelson will return to haunt his son Klaus in dreadful nightmares.

In the last installment, Cami made a desperate attempt to save her uncle Father Kieran, who was hexed and faced an imminent death. However, previews of the upcoming episode, entitled "A Closer Walk with Thee," shows that a funeral service will be held in New Orleans, which could be a sign that the poor preist didn't make it, notes VampireDairies.AlloyEntertainment.com.

The official trailer for episode 20 also shows that Klaus's father will return to wreak havoc in New Orleans and haunt Klaus's dreams.

"Greetings, boy," says Mikael to Klaus in one clip from the teaser video. In another scene, Klaus expresses grief over his nightmares saying, "My father is literally mocking me from beyond the grave. The spirit world is crumbling."

However, he isn't the only one having nightmares involving Mikael. Hayley is also seen experiencing hellish dreams where it appears that Mikael is biting her neck. "I'm dreaming. This is a nightmare," she says in a clip. However, Mikael responses saying, "On the contrary, this is very real."

The video then cuts to a shot of Hayley laying on the ground while covered in blood, followed by terrifying screams.

According to CarterMatt.com, the official synopsis states:

"Hayley (Phoebe Tonkin) confronts a surprising enemy as she and her unborn baby fall into peril during a celebratory wake to honor a fallen member of the community. In order to save Hayley, Klaus (Joseph Morgan) and Elijah (Daniel Gillies) enlist the help of Genevieve (guest star Elyse Levesque) who struggles to maintain control over Davina (Danielle Campbell) and the other young witches. Cami (Leah Pipes) tells Marcel (Charles Michael Davis) that Francesca (guest star Peta Sargent) is determined to find a mysterious key that may unlock a family secret. Meanwhile, as Klaus suffers from nightmares of his father Mikael (guest star Sebastian Roche), he is forced to examine his troubled relationship with his own adoptive son, Marcel."

"The Originals" S1E20, "A Closer Walk with Thee," airs Tuesday, April 29 at 8 p.m. EDT on the CW.

Watch a preview clip below.