The CW posted an updated Season 7 Official Description, a bit more detailed.
Read it:
The thrilling and terrifying journey of the Winchester Brothers continues with the seventh season of “Supernatural” on The CW.
Twenty-six years ago, Sam Winchester (Jared Padalecki) and Dean Winchester (Jensen Ackles) lost their mother to a mysterious and demonic supernatural force. Subsequently, their father John (Jeffrey Dean Morgan, “Watchmen”) raised them to be soldiers. He taught them about the paranormal evil that lives in the dark corners and on the back roads of America…and he taught them how to kill it.
Sam (Jared Padalecki) and Dean (Jensen Ackles) have battled every kind of supernatural threat. After dozens of bloody adventures, they finally closed in on their dark destiny: with the help of their friends, father-figure Bobby (Jim Beaver, “Deadwood”) and fallen angel Castiel (Misha Collins, “24”), they managed to avert the Apocalypse. But the victory came at terrible cost: Sam sacrificed himself, to be imprisoned in Hell alongside Lucifer. Devastated, Dean retired to civilian life-and was shocked when, a year later, a mysteriously resurrected Sam appeared at his door. Back in the hunt, the brothers faced increasingly strange, deadly creatures, ultimately fighting their way to the original monster-the Mother Of All. And Dean discovered the shocking, dangerous truth about Sam: he’d returned from Hell-but without his soul, leaving him calculating and untrustworthy. In a risky move, Dean restored Sam’s soul, but at great cost. Sam was flooded with horrific memories of Hell, memories that threatened to overtake him, even kill him. Meanwhile, Civil War in Heaven raged on. Castiel, determined not to lose, made the reckless choice to open a door to Purgatory, repository for all monster souls. His gambit: harness the power of those souls by absorbing them. Ignoring Sam and Dean’s warnings, Castiel made a deal with the King of Hell to find that door.
Now, despite Sam and Dean’s efforts to stop him, Castiel has succeeded in his plan. His power is God-like, and Sam and Dean have no idea how to stop him. But even Castiel doesn’t truly understand the magnitude of what’s inside him — or how dangerous he really is.
Season seven finds Dean and Sam reeling from the loss of their friend. Sam’s violent memories of Hell threaten to overtake him, threatening not just his life, but his brother’s as well. Meanwhile, Dean struggles under the weight of a secret that threatens to tear them apart. And even as the brothers traverse the backroads of America, hunting things that go bump in the night, something is coming for them. They are about to face an enemy more canny and adaptable than any they’ve ever fought. As the landscape around them becomes increasingly treacherous, the tools they’ve come to rely upon will be stripped away. Our heroes, like so many outlaws before them, will find themselves utterly outmatched and outgunned, with no one to rely on but each other.
From Warner Bros. Television in association with Wonderland Sound and Vision, with executive producers McG (“Charlie’s Angels,” “The O.C.”), Robert Singer (“Midnight Caller”), Sera Gamble and Phil Sgriccia.
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