Episode | 3: Original Sin

In The Vampire Diaries season 5, episode 3, titled " Original Sin ," the ancient witch Qetsiyah returns to manipulate the doppelgängers, revealing she created the first immortals, Silas and Amara. She rescues Stefan from a quarry, but a binding ritual to neutralize Silas leaves Stefan with no memory of his past, creating a new crisis for Elena and Damon. The episode, which focuses heavily on the origins of the doppelgängers, also shows Silas targeting Katherine to drink her blood, which has become the Cure, and highlights the potential for Stefan and Elena to be destined for each other.