Supernatural - — Season 1- Episode 16

While the pilot introduced the Winchesters and "Home" (S1E09) introduced the psychic connection to the house, is the episode where the series grew up. It removed the training wheels of "venging spirits and wendigos" and introduced the central conflict of the first five seasons: The Demon wants Sam, and the family must stay broken to survive.

While investigating, Sam and Dean reunite with a figure from Sam’s past: (Nicki Aycox), a sharp-tongued, flirtatious young woman whom Sam met during his college years at Stanford. Initially, Meg appears to be an ally, helping the brothers decode the Daeva’s origins. She flirts openly with Sam, creating a brief moment of levity and romantic tension. Supernatural - Season 1- Episode 16