Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
He is the man who made the Daleks - the greatest threat the universe has ever seen. But what made the man? This series of four full-cast audio dramas chart the rise to supremacy of the infamous Davros.