" When the Levee Breaks " is the 21st episode of Supernatural 's fourth season and the 69th episode overall. Premiering on May 7, 2009, it serves as the penultimate episode of the season, directly setting the stage for the apocalypse.
: Dean tracks Sam to a motel, leading to a violent brawl. After Sam nearly strangles him, Dean delivers a final ultimatum: if Sam walks out the door, he should never come back. Sam leaves, effectively severing their bond as they head into the finale. Major Character Dynamics [S4E21] When the Levee Breaks
: Directed by Robert Singer and written by Sera Gamble. It is one of only three episodes in the entire series where no characters die. " When the Levee Breaks " is the
: Ruby reveals that Lilith is "Lucifer's first" demon and that only she can break the final 66th seal. After Sam nearly strangles him, Dean delivers a
: During withdrawal, Sam suffers intense hallucinations, seeing himself tortured by the demon Alastair , being accused of betrayal by his 14-year-old self , and receiving misguided encouragement from a vision of his mother, Mary .
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