"Part Four: Eye of Darkness", Part Five by Matt Fitton , John Dorney , Paul McGann , Nicola Walker , Alex MacQueen , Nicholas Briggs , Sorcha Cusack , Derek Hutchinson , Charlie Norfolk , Rachael Stirling , Dan Starkey , Susannah Harker , Barnaby Kay , Beth Chalmers , Blake Ritson , David Sibley , Camilla Power & Alex Wyndham