Castiel , who rebelled against Heaven for Dean, reaches his limit. After Dean tries to trick him with an angel-banishing sigil, Cas delivers a brutal physical beatdown, shouting that he didn't give up everything only to watch Dean "fail". The Return of the Third Brother Supernatural: "Point of No Return" - AV Club
The Road So Far: A Milestone Look at "Point of No Return" Supernatural ’s 100th episode, (Season 5, Episode 18), is more than just a numerical milestone; it is the definitive tipping point for the series' original five-year arc. Originally aired on April 15, 2010, and written by Jeremy Carver , this episode strips the Winchester brothers down to their rawest nerves before forging a new, defiant path forward. The Weight of the World: Dean’s Darkest Hour [S5E18] Point of No Return
Dean’s despair leads to some of the show’s most painful character interactions: Castiel , who rebelled against Heaven for Dean,