An all new episode of The CW's "The Vampire Diaries" returns on Dec. 5, promising to reveal what an Augustine vampire is and who the Augustine vampire was. Plus, because Damon has been captured by Dr. Wes, it will be up to Elena and Aaron to find him.

After Damon tells Elena "about a terrible ordeal in his past that he's kept secret for decades" alluding to his time as an Augustine vampire, Elena "shares disturbing information she learned about her own family," reports the IBTimes. This may something to do with her adoptive dad Grayson, a former Whitmore professor.

Meanwhile in the upcoming episode, which is titled "The Cell," Caroline comes to Stefan's aide with an "unusual form of therapy" just as she, Stefan, and Katherine are all going through a rough time.

An reports that an official synopsis about "The Cell" reads:

"Stefan (Paul Wesley) continues to offer Katherine (Nina Dobrev) his support while trying to mask his own pain, until Caroline (Candice Accola) shows up with an unusual form of therapy. After trying to make amends with Caroline, Elena (Nina Dobrev) grows so concerned about Damon (Ian Somerhalder) that she turns to Aaron (guest star Shaun Sipos) for help. Later, when Damon tells Elena about a terrible ordeal in his past that he has kept secret for decades, she shares the disturbing information she just learned about her own family. Finally, Aaron decides on a desperate course of action after a conversation with Dr. Wes (guest star Rick Cosnett)."

According to TV Line, fans of "The Vampire Diaries" can expect to see "really cool flashbacks" that are described as "brutal" and "crazy" by Ian Somerhalder. In addition, Nina Dobrev claims that some scenes are "disgusting."

"It was disgusting," Dobrev told TV Line. "I'm not good at that kind of stuff and I hated watching it. I'll probably have to close my eyes when I watch it on TV."

The flashback will reportedly occur after Dr. Wes does some "testing" on Damon which then stirs up some bad memories that took place in the 1950s.

Fans can also look forward to Bonnie being visited by a few familiar ghostly faces since she is the anchor to the Other Side. Kat Graham told TV Line, "Yes, Bonnie is going to see a lot of familiar faces. You are going to see a lot of familiar faces. I like the way I answered that question, so I'm just going to pat myself on the back."

"The Vampire Diaries" returns on Thursday, Dec. 5 at 8 p.m. ET on the CW.