Fans of "The Vampire Diaries" will see if Caroline's vampire blood can save her mother, Sheriff Liz Forbes, from cancer in Thursday's all-new episode.

In last week's winter premiere of "The Vampire Diaries," Kai tormented Elena to hone his magic, while Stefan went on the hunt for family ties, reports Celeb Dirty Laundry.

Meanwhile, Caroline searched for a vampire blood-based cancer cure for her mother. However, towards the end of the episode, another patient who received Caroline's blood started coughing up bodily fluids and died on the hospital floor.

A promo video of the next episode, titled "Prayer for the Dying," shows that Caroline will become worried that the vamp blood will also have an adverse effect on her mother.

"The blood didn't heal him, it sped up his cancer and killed him," Stefan says in the preview video while looking at an X-ray with Caroline.

Another clip shows the dead cancer patient, who appears to be a vampire, creeping up towards Caroline's window.

"Why did I feed her that blood?" Caroline says regretfully.

"You took a risk," he says. "You did it out of love," Stefan says in response.

In the final moments of the promo, a medical team appears to be trying to shock Liz back to life.

The CW also released an exclusive sneak peak from the new episode that shows Damon asking Elena out on a traditional dinner-and-movie date. However, Elena rejects the idea of reliving a date that they have already done in the past, and instead pushes Damon to be creative.

According to Dread Central, the official synopsis for "Prayer for the Dying" reads as follows:

"When Liv (guest star Penelope Mitchell) and Luke's (guest star Chris Brochu) father arrives to town to celebrate their birthday, they try to convince him to let Jo (guest star Jodi Lyn O'Keefe) and Kai (guest star Chris Wood) take their place in the merge ceremony. After Tyler (Michael Trevino) finds out that the merge is happening sooner than he expected, he urges Liv to let him talk to her father.

"Meanwhile, after Caroline's (Candice Accola) plan to cure her mother takes an unexpected and devastating turn, Elena (Nina Dobrev), Stefan (Paul Wesley), and Damon (Ian Somerhalder) gather at the hospital, while Jo attempts to save Sheriff Forbes' (guest star Marguerite MacIntyre) life.

"Lastly, with the merge set to take place, Damon's risky plan quickly sends things spiraling out of control, forcing one of the twins to take matters into their own hands."

Season 6, Episode 12 of "The Vampire Diaries," titled "Prayer for the Dying." will air Thursday, Jan. 29 at 8 p.m. ET on The CW.

Watch a video promo below.

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