The Secret War was a six–part television series produced by the BBC in conjunction with the Imperial War Museum documenting various technical developments during the Second World War. It was aired during 1977 and presented by William Woollard. The programme opening music was an excerpt from Mussorgsky's Pictures at an Exhibition. The closing music was by the BBC Radiophonic Workshop. The 'seventh' episode often included with video versions of the series was not part of the original series but produced separately.