Ruby (Supernatural) - Plot

Plot

In the beginning, not much is known about Ruby, a mysterious blonde first seen in the third season episode "The Magnificent Seven". She trails hunter Sam Winchester throughout the episode, eventually coming to his rescue when he is in danger of being killed by Pride and two other demonic Sins. As opposed to using traditional demonic abilities such as telekinesis, she instead relies on conventional martial arts and her demon-killing knife in the fight. Ruby next appears in "The Kids Are Alright", and reveals herself to be a demon at the episode's conclusion. Sam threatens to shoot her, but then decides to let her live and continue to "help him". Ruby does so in "Sin City", assisting hunter Bobby Singer in restoring power to the Colt—a mystical gun capable of killing anything.

She reveals in "Malleus Maleficarum" that she used to be a witch who sold her soul to a demon before her death during the Plague. Ruby later tells Dean Winchester she can't save his soul. She adds she still remembers what it's like to be human and says that she isn't the same as the other demons, though she wishes she were. Ruby returns in "Jus in Bello", offering to perform a spell which will destroy the attacking horde of demons, though it will also kill her. However, because the spell requires a human virgin's heart, Sam and Dean don't allow her to perform it.

In the season finale, Dean captures Ruby in a devil's trap painted on the ceiling, steals her knife, and leaves with Sam to face the demon Lilith, who holds the contract for Dean's soul. During the brothers' campaign, Ruby somehow frees herself and tracks them down, helping them find Lilith. The demon escapes, however, and the trio runs away from the hellhound tracking Dean down. During the mayhem, Lilith takes over Ruby's host, sending Ruby back to Hell. Horrified when her powers have no effect on Sam, Lilith flees her host before Sam can retaliate.

As revealed in the later episode "I Know What You Did Last Summer", Ruby eventually convinces Lilith to trust her again, and is set free from Hell with instructions to kill Sam. She apparently betrays this promise to Lilith, however, and sets about helping Sam. She tracks him down, but he rejects her since she is possessing a human host played by blonde Anna Williams. To solve this, Ruby takes possession of a body recently declared to be dead, played by Genevieve Cortese. They sleep together at least once, and she brings him out of his downward spiral towards self-destruction. Consequently, Sam now trusts Ruby implicitly. She then begins training him in using his demonic abilities to exorcise demons, and continues to do so in secret following Dean's resurrection by the angel Castiel. The episode "On the Head of a Pin" explains what has caused Sam's boost in power: he is drinking Ruby's demonic blood. In the fourth season finale, Ruby reveals herself as a double agent working for Lilith; having gained Sam's trust, she tricks him into killing Lilith to break the final seal and release Lucifer. After her true motives are revealed, she is killed by the Winchesters with her own knife.

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