Sunlight 349 is one of countless Dalek Foundation worlds, planets created to house billions suffering from economic harship. The Doctor arrives at Sunlight 349, suspicious of any world where the Daleks are apparently a force for good - and determines to find out the tuth. The Doctor knows they have a far more sinister plan - but how can he convince those who have lived under the benevolence of the Daleks for a generation?

But convince them he must, and soon. For on another Foundation planet, archeologist have unearthed the most dangerous technology in the universe...