Kat Graham
Kat Graham as BonnieFacebook/The Vampire Diaries

The filming for Season 8 of "The Vampire Diaries" has commenced, and we are nearing the time when we'll have to say goodbye to both Bonnie and Damon.

The actors who essay these characters – Kat Graham and Ian Somerhalder -- have decided to quit the show after the upcoming season, and there's a lot of interest in how their departure will affect their onscreen characters.

According to one popular theory, Season 8 will end with Bonnie's death, which will bring Elena back to the land of the living. As fans of the show know, Kai put Elena in a magic-induced sleep in the Season 6 finale and linked her life to Bonnie's in such a way that Elena won't wake up as long as Bonnie lived.

While there are many who want Elena and Damon to be the endgame, some others believe that both Bonnie and Damon will die when the season comes to a close. Chances are also high that "The Vampire Diaries" will wind up with Season 8, as it would have lost at least three of its main characters, including Nina Dobrev. The ratings have also not been too kind to the vampire drama. The network will take the final call based on audience reaction. "In my dreams it isn't [the last season], but we will see how the audience will react," CW president Mark Pedowitz told the media back in May.

However, showrunner Julie Plec had earlier said she wanted to carry on with the show only as long as both Ian Somerhalder and Paul Wesley were on board. "I finally realized that my destiny on this show, creatively, is tied to Ian Somerhalder and Paul Wesley. And I mean that in a really good way. As long as those boys who I now consider my friends want to keep telling the story, then I won't walk away from telling the story," she told E!News in January.

"The Vampire Diaries" returns Friday, October 21 at 8 p.m. ET/PT on The CW.