Episode 1 Standing Up in the Milky Way Episode 2 Some of the Things that Molecules Do Episode 3 When Knowledge Conquered Fear Episode 4 A Sky Full of Ghosts Episode 5 Hiding in the Light Episode 6 Deeper, Deeper, Deeper Still Episode 7 The Clean Room Episode 8 Sisters of the Sun Episode 9 The Lost Worlds of Planet Earth Episode 10 The Electric Boy Now Playing Episode 11 The Immortals Episode 12 The World Set Free Episode 13 Unafraid of the Dark