The tenth episode of The Vampire Diaries first season, titled "," originally aired on November 19, 2009. It serves as a major narrative shift, marking the first time Elena and Stefan sleep together and revealing the striking resemblance between Elena and Katherine. Key Plot Developments

After Stefan and Elena spend the night together, Elena finds a photo of Katherine Pierce in Stefan's room. Shocked by the fact that she looks identical to his ex-girlfriend, she leaves her vervain necklace behind and flees in a panic.

Having been turned into a vampire, Logan returns to Mystic Falls. He attempts to enter Jenna's home but is refused entry. He later ambushes Damon with wooden bullets, demanding to know how he can walk in the sun, while Damon tries to learn who turned Logan.