Series 5, Episode 7 – 'The Forgotten Unicorn'

Dr Spotless Dirt has been sent to the Planet of the Buttocks by NASA to find a remedy to save mankind's own backsides from extinction. But it soon becomes clear that this is only one small part of a much bigger threat facing the world, with its roots in biblical times. Let's just say our abnormally puerile audience really outdid themselves with the suggestions this time around...