New "Vampire Diaries" season 6 spoilers reveal who will feature in "The Originals" crossover! Find out everything you need to know about the fourth Petrova doppelganger!

According to TVLine, Nina Dobrev will head to "The Originals" for a special crossover episode later this fall - but she won't be going as Elena! Instead, Dobrev will play Tatia, E! Online reports, a Petrova doppelganger briefly mentioned in the third season of The Vampire Diaries. This means Dobrev will play a fourth doppelganger!

"[Klaus and Elijah] both loved her, so it's a little bit of history repeating itself like with Stefan and Damon," executive producer Julie Plec explained. "The character of Tatia is part of their history. ... It's something we brought up a long time ago and never paid off."

Tatia will appear in a flashback on "The Originals" episode airing on November 4. Tatia's presence will further illustrate her 'complicated' relationship with the Mikaelson brothers, TVLine reports.

Check out the video below for more info about Tatia's character. This is a scene from "The Vampire Diaries" season 3.

"The Vampire Diaries" season 6 has a premiere date of October 2 at 8 p.m. ET on The CW.

"Originals" season 2 premiere date is Monday, October 6, at 8 p.m. ET on The CW.

The official "Originals" season 2 synopsis reads: "Season 2 finds our heroes adjusting to a new status quo, with the newly empowered werewolves controlling the city and a myriad of unknown threats lurking. Though Klaus and Hayley have vowed to scorch the earth in order to make New Orleans a safe home for their daughter, Hope, they also have inner demons to battle. As she adjusts to life as a hybrid, Hayley experiences crippling rage and depression after saying goodbye to her daughter, and Klaus - who needs his strength now more than ever - finds himself regularly weakened as the werewolves use the moonlight rings forged in his blood. Elijah, finding himself isolated from his troubled family, sets out to destroy Francesca (guest star Peta Sergeant) and her traitorous werewolves, connecting with Marcel and his renewed vampire community in the process. Despite the dangerous climate of the city, Cami recommits to her studies and to pursuing the life she wanted before she met Klaus - but the werewolves in the Quarter aren't the only enemies preventing New Orleans from any semblance of peace.

Unbeknownst to Klaus and Elijah, their ruthlessly devious parents have returned from the dead. Though their father, Mikael (guest star Sebastian Roché), is controlled by Davina's magic, he remains ever-intent on killing Klaus - even if he has to go through Davina to do it.  Elsewhere, their mother, Esther (guest star Alice Evans), inhabiting the body of a teenage witch, is fueled by a consuming and twisted love for her children as she devises a disturbing plan to reunite her fractured family - a plan that involves untold torment not only for the Original siblings, but for any and all of their loved ones."