Lilith (Supernatural)

Lilith is a demon from the TV series Supernatural. She is the main antagonist of Seasons 3 and 4.

Lilith was the first demon ever created, when Lucifer turned a human into her as revenge for God telling him to bow before humans. Lucifer, speaking through the corpse of a dead nun through a sacrifice, told Azazel to get Lilith out of hell where she was imprisoned, as only she could get him out of Lucifer's Cage, in the deepest area of hell, where he was imprisoned.

Azazel eventually succeeded in opening the Hell's Gate when he convinced Jake, one of many whom he had given psychic powers, to open the Hell's Gate (since it was in the center of a giant Devil's Trap that a demon could not cross). Lilith was among the many demons who escaped. Unfortunately for the demons, Azazel was killed by Dean Winchester.

Lilith eventually became the new leader of the demons. After Victor Henriksen, who had been out to get Sam and Dean (believing them to be guilty of the murders committed by nearly everything supernatural) became caught in the middle and helped them fight off demons, Lilith entered, possessing a little girl, and killed him, along with those with him, in an explosion of light.

She was later revealed to be the demon who holds all the contracts whenever a person sells his or her soul to a demon, as Dean did to bring Sam back to life after Jake killed him. Sam and Dean began hunting down Lilith to kill her and end the deal. Lilith was possessing another little girl, but eventually possessed the body Ruby was possessing. She set the hellhounds on Dean, who killed him and sent him to hell. Her power did not work on Sam, forcing her to retreat.

To awaken Lucifer, 66 seals needed to be broken. Once Alastair talked Dean into breaking the first seal in hell, Lilith began breaking more seals. At this point, the angels entered the battle, with Castiel bringing Dean back to life. In the end, Ruby and Sam tracked down Lilith, who was said to be the only one who could break the final seal. Unbeknownst to Sam, Lilith was the final seal. At the same convent where Azazel killed the nuns, Sam used his demon-killing power to kill Lilith, and with her death, Lucifer was awakened.

In the second last episode of Season 4, Lilith is revealed to eat babies.