Hoping to pay back their debt, the team takes on a job for an unexpectedly high-profile client. But the task proves more treacherous than they imagined.
As Lockwood and Lucy uncover the nature of the bone glass, they come to understand that George’s life is in danger — and time’s running out to save him.
An alien warlord sets a twisted plan in motion in order to ensure his survival on a remote Army outpost, and the Doctor may have to do something unthinkable.