 At the house , the Doctor is surprised by Caecilius 's daughter Evelina , who seems to have extrasensory perception ( ESP ) and knows personal details about the Doctor and Donna . They are interrupted by the local augur , Lucius Petrus Dextrus , who has arrived to collect a sculpture he commissioned . The Doctor is intrigued by the sculpture , which resembles a segment of an oversized circuit board . Lucius Petrus reveals that he also has powerful ESP and calls out the name of the Doctor 's home planet , Gallifrey . The Doctor wishes to learn more about the sculptures and enlists Caecilius 's son Quintus to help him break into Lucius Petrus ' house . Inside , the Doctor deduces that the circuits will make an energy converter , but he is caught by Lucius Petrus . The two escape , but Lucius Petrus beckons a large stone creature to attack and kill them . The stone creature appears in Caecilius 's house and attacks them , but Quintus saves them by dousing the creature in water and killing it . In the confusion , the Sisterhood kidnap Donna , and the Doctor sets off to rescue her . He meets the high priestess of the Sisterhood , who is revealed to be transforming into a stone creature . The Doctor discovers that they are being controlled by the Pyroviles , volcanic creatures whose home planet of Pyrovilia was lost ( see Story arcs in Doctor Who # Medusa Cascade ) . The Doctor is attacked by the Sisterhood , but he escapes with Donna into an underground tunnel that leads into the heart of Mount Vesuvius . 
