The Mikaelsons will once again be at the center of danger in the second to the last episode of "The Originals" season 3. This time, they will combat a dangerous new threat.

According to the synopsis for the episode, titled "Give 'Em Hell Kid," Freya (Riley Voelkel) will find out through a prophecy that she and her siblings will be attacked by a brand-new enemy.

After Lucien was finally defeated by the family when Klaus (Joseph Morgan) ripped his mouth in episode 20, viewers could expect a different but very powerful enemy who will threaten the lives of the Mikaelson siblings. However, the synopsis failed to mention who is up against the original vampire family.

But while the family is preparing to face their new foe, another challenge that will fall on the Mikaelsons' laps is the sudden shift of Marcel's (Charles Michael Davis) opinion on the family. In the previous episode, the siblings allowed Davina to die. This broke Marcel's heart, and made him reassess his loyalty to the family.

In an interview with Entertainment Weekly, showrunner Michael Narducci explained that Marcel's views about the Mikaelson will change.

"The Mikaelsons will take care of each other no matter what and he is not someone inside that circle of protection. And just at this moment when he's looking at them with new eyes, an opportunity has come into play that would change forever the power dynamic," Narducci explained. "That, to me, is one of the most exciting things about this entire season, the idea of a Marcel who is no longer beholden to Klaus and a second-string power level to Klaus. Marcel has a very difficult choice ahead of him."

Meanwhile, Vincent (Yusuf Gatewood) and Kol (guest star Nathaniel Buzolic) will seek the help of Detective Kinney (guest star Jason Dohring) to be transported to the ancestral world to prevent the plans of the witches in controlling New Orleans.

"The Originals" season 3 episode 21 airs on Friday, May 13, on The CW.