Wormwood

The Doctor has regenerated, or has he? The TARDIS arrives in Wormwood, an American village, in 1880. However, the Doctor and his companions soon discover they are not on Earth, but the Moon, and they have been lured into a final confrontation with their old enemies, the Threshold. After three thousand years, they are preparing to step out of the darkness and descend on the whole galaxy. Can Izzy and Fey survive in a world populated by ruthless Threshold agents, and what has happened to the Doctor?