00:00Doctor Who: The CommentariesSeries 4Episode 4: The Sontaran StratagemBBC Radio 4 Extra Duration: 30 minutes Mon 28th Apr 2008, 00:00 on BBC Radio 7The Doctor Who cast and crew discuss the fourth episode of the fourth TV series.GenresFactualArts, Culture & the MediaBrandDoctor Who: The CommentariesSeriesDoctor Who: The Commentaries: Series 4 Source: BBC Online