The past, the present, and the future conspire against the Doctor as he fights to defeat the only creature ever to strike fear into the hearts of a Time Lord - the Ravenous. 4.1 Whisper by Matt Fitton. Seeking respite after their battle with the Ravenous and hoping to find a quiet place where the Eleven can recuperate, the TARDIS crew visit the Still Foundation. But all they find is a small band of survivors under siege from a terrifying predator. A predator that hunts by sound. 4.2 Planet of Dust by Matt Fitton. On the parched world of Parrak, the Master holds sway. But he is exhausted and desperate, and his final hope for survival lies somewhere beneath the desert. When the TARDIS arrives, alliances will be made and trust will be broken - and feuding Time Lords will discover the Ravenous never, ever give up. 4.3 and 4.4 Day of the Master by John Dorney. The Doctor investigates a mystery in the vortex, Liv follows the trail of their enemy, and Helen searches for a god. Everywhere they go there is a Master or Mistress, but is the Doctor's oldest enemy there to hinder him, or to help? With the TARDIS crew scattered and lost, only a miracle can save the universe. And for that to happen someone is going to have to die. CAST: Paul McGann (The Doctor), Nicola Walker (Liv Chenka), Hattie Morahan (Helen Sinclair), Mark Bonnar (The Eleven), Geoffrey Beevers (The Master), Michelle Gomez (Missy), Derek Jacobi (The Master), Eric Roberts (The Master), George Asprey (Ravenous), Susie Emmett (Ravenous), Eben Figueiredo (Leet), Chris Jarman (Kyphus), Clifford Samuel (Kinner), Natalie Simpson (Vonn), Ony Uhiara (Ronica), Robert Whitelock (Artron/Cadrin).