Controller (Alvega)
From Tardis Wiki, the free Doctor Who reference
The Controller of Alvega was a huge vegetal root living within the core of the planet. It stayed connected to the surface via roots, allowing it to communicate with and control the Amarylls.
When the Daleks attempted to conquer Alvega, the Amarylls reported the news to the Controller, which resisted them and ordered all Amarylls to attack the Daleks. When the main Dalek Fleet had left and only four ships remained, the Controller sent an earthworm to attack them. One ship escaped beneath the ground, the crew having killed the worm and making their way towards the core.
When all but one Dalek was destroyed, the Dalek destroyed the Controller, causing Alvega to explode. (DC: The Amaryll Challenge)
