Writer, comedian, amateur astronomer and astrophotographer Dara Ó Briain explores the importance of the moon to life on Earth and how it may play a part in humanity's future. Along the way, he discovers more about the myths around the moon and learns how the ancient archaeological site of Newgrange in Ireland may record its phases. Later, Dara looks to the future as he meets an astronaut, discovers the steps scientists are taking to crack the moon's secrets, and learns how it may soon be possible to 3D print a moonbase.