Synopsis
The TARDIS takes the Doctor and Rose to the Justicia System — a prison camp comprising the six planets in that solar system. The pair are separated and trapped in different environments, each determined to escape in their own distinctive style. However, their plans are complicated when some old enemies show up. Are the Slitheen really attempting a takeover of Justicia, or is it something far more sinister?
Read more about this topic: The Monsters Inside (Doctor Who)