Beyond the VortexSeries 2Episode 6: Trevor of the ZygonsBBC Radio 7 Duration: 10 minutesFirst broadcast: Sun 23rd Nov 2008, 18:50 on BBC Radio 7Latest broadcast: Fri 2nd Oct 2009, 00:50 on BBC Radio 7Singing monsters on the shores of Lake Grasmere? Radio 7 goes behind the scenes of Doctor Who's 'The Zygon who Fell to Earth'.GenresDramaSciFi & FantasyBrandBeyond the VortexSeriesBeyond the Vortex: Series 2 Source: BBC Online