Blink

The Daleks assemble the leaders of several alien empires, apparently intending to unite them in an Alliance which will then declare battle on Earth. In fact, each empire has brought components or technology which the Daleks require to construct the ultimate weapon – a Time Destructor. The last component they require is the power source, a core of the rare element Taranium – and Mavic Chen, the Guardian of the Solar System, intends to supply it to them and then betray them, seizing the Time Destructor for himself.