"Part One: Deeptime Frontier", Part 12 by Matt Fitton , John Dorney , Paul McGann , Nicola Walker , Hattie Morahan , Leighton Pugh , Dan Starkey , Rakhee Thakrar , Alex Kingston , Ajjaz Awad , Mark Bonnar , Amaka Okafor , Damian Lynch , Tania Rodrigues , Tanya Moodie , India Fisher , Arthur Hughes , George Asprey , John Heffernan & Susie Emmett