To celebrate the 50th anniversary of the launch of Sputnik Nick Walker was commissioned to write the sci-fi adventure 'The First King Of Mars'. Now, in five, thrilling, action-packed episodes we continue the story where it left off with our fearless commander, previously employed to head-up the first manned mission to Mars, plummeting towards the planet with no thick atmosphere to slow him down. Starring Peter Capaldi. Producer: Karen Rose A Sweet Talk Production for BBC Radio 4.