The Time Lords intercept the transmat beam taking the Doctor, Sarah and Harry back to Nerva and deposit them instead on the planet Skaro at an early point in its history. There a Time Lord gives the Doctor both a mission to prevent or alter the Daleks' development so that they become less of a threat to the universe and a time ring that will enable him and his companions to return to the TARDIS once this is done.

The Doctor picks up a distress call from the edge of the known universe, where he comes across a geological team that has run afoul of some strange goings on.

The Time Lords intercept the transmat beam taking the Doctor, Sarah and Harry back to Nerva and deposit them instead on the planet Skaro at an early point in its history. There a Time Lord gives the Doctor both a mission to prevent or alter the Daleks' development so that they become less of a threat to the universe and a time ring that will enable him and his companions to return to the TARDIS once this is done.

The TARDIS lands on Varos.

Slaves watch sadistic video games.

Jemma is away on a business trip, and Leslie's off to a Doctor Who convention. But Jemma calls and asks Leslie to wait in for a package. Well he did say he had no plans.

The Doctor discovers an Ice warrior plot to weaken the Earth's resistance.

Aliens control wars with aim of forming an invincible army to take over the galaxy.