3/10 Marina Warner enters the magical worlds of the fairy tale.
3/5 Poldek takes Thomas to Poland to witness 'the intimacy of horror' in the Krakow ghetto.
3/4 Jonathan Ross, graphic novelist Alan Moore and string theorist Brian Greene on sci-fi.
Film director Gurinder Chadha discusses the influence of her dual Asian and British roots.
1/6 Dave Gorman and Johnny Vegas chew over ridiculous, brilliant but unworkable ideas.
4/10 Marina identifies real people and places believed to have inspired the Grimms' collection.
4/5 The journey ends in Israel and Thomas goes home to write his book.
Michael Morpurgo nominates Wolfgang Amadeus Mozart, assisted by Stephen Johnson.