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Such new material included two new themes for the Doctor, entitled I Am the Doctor and The Mad Man with a Box; along with multiple themes associated with Amelia Pond, and River Song.
In the episode, the Doctor—a time travelling alien played by Matt Smith—and his companions Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill) land in Wales in 2020, where a drilling operation headed by Nasreen Chaudhry (Meera Syal) is drilling deep into the earth and disrupting a civilisation of Silurians who dwell beneath the earth.
In the episode, the Doctor (Matt Smith) and his companion Amy Pond (Karen Gillan) arrive in London during the Blitz, where Winston Churchill (Ian McNeice) has employed "Ironsides", a scientific creation from Professor Bracewell (Bill Paterson) to be used as weapons in the war effort.