When the TARDIS lands 50 years after its first visit to Peladon, the Doctor and Sarah Jane discover a troubled planet ruled by the late king’s daughter. Peladon is at the center of a war – and the Galactic Federation desperately needs a mineral found in the mines. But why is the ghost of Aggedor killing miners, and why can’t everyone be trusted? Queen Thalira needs the Doctor’s help to find out.