Bonnie will take center stage in "The Vampire Diaries" season 7, episode 20, titled "Kill 'em All." As the character's essayer Kat Graham teased, this episode of the vampire drama will be big for her Bonnie as well as the next one.

The promo for the episode definitely confirms the star's words. In the clip, it was Bonnie at the center of it all. In the first seconds, she was being warned by Virginia about something sinister inside a large vault that she advises is better off locked up in there.

A few seconds later in "The Vampire Diaries" season 7 promo, Bonnie seems to have set the monster free. "What did you just do?" he asks his BFF. "I kept my promise," she replied.

Not long after that, folks were shown being attacked by something unseen with one woman warning everybody to run for their lives. From the looks of it, Bonnie has freed Yvette, who her own sister Virginia locked up in the vault four years ago.

As one would expect, the Yvette going out from the vault will definitely be unlike the Yvette that was forced there. As hinted in the promo for "The Vampire Diaries" season 7, episode 20, she might have become murderous.

"Kill 'em All" also sees Enzo and Damon, the two people who has the biggest love for Bonnie, race against the clock to stop Bonnie's condition from worsening. Rayna has decided to give up her life to save Bonnie's, but she won't do so until the hundreds of names she just added on the hit list for Damon to kill are marked off.

Speaking of Damon, the synopsis for the upcoming "The Vampire Diaries" season 7 episode hints that he will make a "fateful" decision, which may forever make or break his friendship with Bonnie.

Apart from Bonnie, "The Vampire Diaries" season 7, episode 20 will also be special for Caroline, because here, she will be roped back into the vampire action she sorely missed.

"The Vampire Diaries" season 7, episode 20 "Kill 'em All" airs April 29 at 8 p.m. ET on The CW.