This documentary celebrates the fortieth anniversary of the 1977 blockbuster dance movie, and sees Strictly Come Dancing's Bruno Tonioli, who was a young dancer in New York in 1977, walk us through the steps that made the movie legendary. He also revisits the streets of New York where the film was shot and looks back at the success of a film that gave everyone disco fever. John Travolta, Barry Gibb and other members of the cast and crew give gripping accounts of supreme success against a backdrop of setbacks and unexpected twists and turns. Bruno unpacks the skill, athleticism and dedication of Travolta, whose incandescent performance prompted a disco dance craze. We also hear about the potent influence of impresario Robert Stigwood, whose faith in Travolta and a group who had hit a glitch in their career - The Bee Gees, proved visionary.