[s4e21] When The Levee Breaks Direct

: The title is a nod to a 1929 blues song famously covered by Led Zeppelin in 1971.

: Faces internal conflict after being ordered to sabotage the brothers' efforts, ultimately capturing Anna Milton when she confronts him about his actions. Lore and Production Details [S4E21] When the Levee Breaks

: Portrayed as a "villain protagonist" struggling with a supernatural addiction he believes is necessary to kill Lilith and stop the apocalypse. : The title is a nod to a

" 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. " When the Levee Breaks " is the

: 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

: 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 .