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The Battle of GeoComTex began when the "last" Dalek escaped from an area within a GeoComTex facility known as The Vault in 2012. Two hundred security personnel fought the Dalek, but all were exterminated without damaging it. The Dalek continued travelling through the facility, up through the facility's staircases. In one skirmish with the facility's remaining security forces, it activated the fire extinguishers, killing all the humans simultaneously (utilising the Dalek weaponry's conductive ability).
The Dalek eventually located Henry van Statten, the human who had held it captive and nearly killed him, but was halted by Rose Tyler. Rose Tyler had some sway over the Dalek's actions as it had absorbed her DNA to regenerate itself and escape its captivity. A side effect of this absorption was an awakening of its emotions. Though the The Ninth Doctor threatened to destroy the Dalek with an alien weapon, he was also halted by Rose once she showed him the Dalek's change. It ended its emotion-induced pain by self-destructing. It asked Rose to give this order herself, which she did reluctantly. Following this outcome the facility was sealed off, and Henry van Statten's memory was erased. (DW: Dalek)