S7, E12: When his experience in the Phoenix stone leads him to do the unthinkable, Damon finds himself without a care in the world, spiraling out of control and under the influence of a dangerous and reckless Julian (recurring guest star TODD LASANCE). Refusing to give up on his brother, Stefan attempts to reason with Damon, only to uncover the devastating reason for his descent. Elsewhere, Caroline begins having some dangerous side effects as a result of her supernatural pregnancy and is forced to turn to Valerie (recurring guest star ELIZABETH BLACKMORE) for help. Meanwhile, Bonnie, Nora (recurring guest star SCARLETT BYRNE) and Mary Louise (recurring guest star TERESSA LIANE) attempt to track down a ruthless vampire hunter named Rayna (recurring guest star LESLIE-ANNE HUFF) after they suspect that she has reemerged.