On Rotten Tomatoes, Supernatural Season 6 holds a 67% approval rating — the lowest of the first six seasons. Critics praised individual episodes (“The French Mistake” is at 100%) but called the overarching plot uneven. Among fans, Season 6 is often ranked middle-to-low, though many now defend it as necessary table-setting for the show’s later years.
Castiel is embroiled in a celestial civil war against the archangel Raphael. To gain the upper hand, Castiel secretly allies with Crowley to open the gates of Purgatory and absorb its millions of souls for power. Production and Reception
Supernatural Season 6 was a polarizing turning point for the series, as it was the first to move beyond creator Eric Kripke’s original five-year plan. Taking place one year after the "Swan Song" finale, it finds Dean attempting a normal "apple pie" life before Sam—who is mysteriously back from Hell—reappears.
: Samuel Campbell is secretly working for Crowley, the new King of Hell, to capture "Alphas" (the first of each monster species) to find the location of Purgatory. Civil War in Heaven