18:30Arthur Conan Doyle - Professor ChallengerEpisode 1: When the World ScreamedBBC Radio 4 Extra Duration: 30 minutes Sun 12th Aug 2012, 18:30 on BBC Radio 4 ExtraSir Arthur Conan Doyle's irascible academic sets out on a bold mission to be recognised by Mother Earth. Stars Bill Paterson.GenresDramaSeriesArthur Conan Doyle - Professor Challenger Source: BBC Online