Van Statten Incident

The Battle of GeoComTex started when the "last" Dalek escaped the Vault in 2012, at the GeoComTex facility known as the Vault. Two hundred security personnel fought the Dalek, but all were exterminated without even scratching it. The Dalek kept travelling through the base, up a staircase and even turned on the sprinklers to quicken the extermination process of the humans, as the Dalek's laser held electric properties. The Dalek eventually found Henry van Statten and nearly killed him.

The Dalek had absorbed Rose Tyler's DNA to regenerate itself and escape. A side effect of this was that it has been contaminated with emotions. Though the The Doctor threatened to destroy the Dalek with an alien weapon, he was convinced otherwise by Rose once she showed him the Dalek's difference to before. It ended its pain by self-destructing. It needed someone to give it orders so it asked Rose to give this order herself, which she reluctantly did. The base was sealed off, and Henry van Statten's memory was erased. (DW: Dalek)