Supernatural is going big for its fifteenth and final season.
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According to star Misha Collins, who plays Castiel...
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...the Season 15 premiere will channel some of the biggest fantasy shows in recent memory.
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"It's like The Walking Dead meets [Game of Thrones'] White Walkers out there," Collins told TVInsider.
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"So we have to make a deal with the devil to help us. It's a difficult pill for Cass to swallow."
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The report clarified that Castiel and the Winchesters don't team up with the actual Devil.
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However, Collins teased this Faustian bargain won't sit well with the angel...
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...especially following his recent failure to save Jack from himself -- and from God.
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"For Cass to have been on watch when Jack died is a crushing blow to him."
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Supernatural returns Thursday, Oct. 10 at 8 p.m. ET/PT on The CW for its final season.
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