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Pilot John Hardin has a dark history. He and his Cherokee girlfriend, Kitty Birdsong, are enjoying life in the Great Smoky Mountains when former BATF agent Nolan Rader emerges from John's violent past and demands help to save his younger brother, Clint, from the vengeance of the Satan's Ghosts outlaw motorcycle gang.
A warped genius called Brain controls the Satan's Wraiths, an elite cadre of trained hitters within the gang, and Brain is privately conducting psychological research on Clint ...