Danny Simmons
Simmons was a technician in the employ of Henry van Statten. Simmons tortured the Dalek (which van Statten had named the 'Metaltron') while van Statten attempted to discover what it was. He apparently enjoyed his job, and appeared to be cold and sadistic
After the Dalek used Rose Tyler's DNA to regenerate itself, Simmons confronted the creature. He arrogantly mocked it, ignorant of the mortal danger he was in. He finally realized what he had truly been "working" with as the Dalek clamped its "sucker" onto his face, suffocating him and apparently even crushing his skull. (DW: Dalek).
Behind the scenes
The character was named after Kai Simmons, the actor who played the corresponding role of Dalek torturer Lamb in Jubilee, the audio story that the television episode Dalek was based on.