The second album by Black Sabbath, released in 1970, has long attained classic status. Paranoid not only changed the face of rock music forever, but also defined the sound and style of Heavy Metal more than any other record in rock history. The result of a magic chemistry between four English musicians, it catapulted Black Sabbath into the rock stratosphere.

The program tells the story behind the writing, recording and success of this groundbreaking album. Using exclusive interviews, musical demonstration, archive footage and returning to the multi-tracks with engineer Tom Allom, the film reveals how Ozzy Osbourne, Tony Iommi, Geezer Butler and Bill Ward created their frighteningly dark, heavy and ear-shatteringly loud sound.