Plutonia 7 was a planet which was invaded by the Daleks.
Famed for its mineral-rich rocks and soil, Plutonia 7 was home to several species of giant insects. It was the site of many invasion attempts; however, the aggressive nature of the planet's native life (giant insects such as wasps and praying mantises) defeated many invaders. In the 43rd century the Daleks, seeing great potential in the strength of these creatures, planned to enslave them and use them to mine metals from the centre of the planet, which they would use to build a fleet of ships to aid the Daleks' future invasion plans. Unfortunately for the Daleks, they did not realise that the large exoskeletons of these creatures were extremely strong armour, strong enough to resist even Dalek firepower. Aside from wildlife, the planet was also home to giant carnivorous plants which trapped the Daleks in their jaws, crushing their dalekanium casing and devouring the Kaled mutants inside. Although the Daleks' initial force was totally defeated, suffering far more casualties than expected, the possibility of a second, stronger invasion, threatened the extraordinary planet. (PROSE: Battle for Pultonia 7)
During the Last Great Time War, Romana II acknowledged Plutonia 7 as a planet which had been invaded by the Daleks. (AUDIO: Beyond)