The Vampire Diaries season 3, episode 18, titled "The Murder of One," centers on the Salvatore brothers' high-stakes plan to eliminate the Original vampires using White Oak stakes. The episode introduces the critical bloodline theory, where killing an Original vampire causes all vampires in their lineage to die. The series is officially available to stream on platforms like Max and Netflix, or for purchase on Amazon Prime Video, Apple TV, and Google Play. The Vampire Diaries: Season 3, Episode 18 | Rotten Tomatoes