You think you know Damon Salvatore, but you really have no idea. And on "The Vampire Diaries" midseason finale, airing Thursday on the CW, fans will get to know even more about the bad boy vampire.

"I think fans are going to learn a lot about why Damon is who he is. I think tonight's episode, I really, really enjoyed the history that we learned," "VD" star Candice Accola told MTV News.

Last fans left off, Damon (Ian Somerhalder) and girlfriend Elena (Nina Dobrev) had been held captive by the Augustine vampire secret society of Whitmore College. Led by Dr. Wes, the society is using Damon and Elena for experimentation. And come this episode, viewers will get to learn even more about their roots and Damon's connection to them.

"Tonight, I'm most excited for fans to see the history of Whitmore College and how it's not only played a part in the surrounding area in the new college students... there's been secrets living in that campus for many years," she teased, adding that her own character, Caroline, will likely be caught in their web too.

"I think it's impossible for Caroline not to get caught up in the cult. I think she definitely will not shy away from being involved," she previewed. "If anyone's trying to lead a normal life, I think that Caroline is the frontrunner of it. Her biggest concern this year is being heartbroken over Tyler, so I think she's been just as concerned about just trying to get over a broken heart and realizing that that even in her love life she can't even get a break from the supernatural world."

The episode is titled "Fifty Shades of Grayson," which is an interesting choice given that Somerhalder was once rumored to play Christian Grey in "Fifty Shades of Grey." However, Accola thinks it's just pure coincidence.

"Sure! I mean I don't think it was meant to be. I don't necessarily [think] it was like 'Hey guys, remember that time when Ian [was attached to] Christian Grey?' I don't think it was necessarily that," she said. "I think it's a pop culturally, they are really good about incorporating pop culture references into the series, which is really fun when you got these ancient vampires that know what's going on in today's world. I think they just want to do that with the title too."

The "Vampire Diaries" midseason finale will air at 8 p.m. ET on the CW, followed by the midseason finale of "Reign."