P7E

The P7E was a Minyan spaceship. After the nuclear war which destroyed the Minyan civilisation, the P7E left for the stars.

Its crew brought with them the race banks of their people. They were caught in a nebula where the ship was turned into a planet — thus, instead of settling on a new world, they became one. The Minyans survived and became the ancestors of a bizarre culture enslaved by the Oracle. After the Fourth Doctor and Leela helped them overthrow the Oracle and head for a new home, (TV: Underworld) Daleks from the early Time War set their sights on the ship, fearing that the reborn Minyan race would side with the Time Lords in the War. They boarded the ship and claimed they only wanted to momentarily borrow the race bank for study, whereas they actually intended to alter the genetic information so that the new Minyans would become a slave-race instinctively loyal to the Daleks. Forewarned about the danger thanks to a remporal crisis that put him in contact with his future incarnations, the Fourth Doctor returned to the ship and, with Leela's help, defeated the Daleks before they could take the race bank. (GAME: Lost in Time)

Behind the scenes
Many of the names and incidents in Underworld were derived from the myth of Jason and the Argonauts. However, the name of the P7E comes from another Greek myth, the story of Persephone, the goddess who was imprisoned in the underworld.