Kandyman

The Kandyman was a robot created by Gilbert M and employed by Helen A.

Biology and Personality
The Kandyman (or Kandy Man) was a pathological, psychopathic robotic killer who was employed by the egocentric Helen A. The Kandyman delighted in creating methods of torture and destruction using confectionery, such as drowning people in sugary solutions like its "fondant surprise". It was a sadistic monster with a very warped sense of humour, speaking with a squeaky metallic voice and producing deadly sweets. These sweets were supposed to be so good that humans were unable to cope with the pleasure and died. The Kandyman claimed most of its victims in this manner — "with smiles on their faces" — but this did not mean it was not perfectly happy to throttle them if they refused to co-operate.

Composed of things like sherbet, marzipan and caramel, Kandyman was created by Gilbert M, with whom it shared an almost symbiotic relationship.

With the Happiness Patrol
The Doctor encountered the Kandyman after escaping from the Happiness Patrol. He outsmarted the Kandyman, causing it to smash a bottle of lemonade and stick itself to the floor — it had to keep moving or its constituent ingredients would coagulate. The Doctor escaped, but later returned to the Kandy Kitchen to confront the Kandyman, forcing it to retreat into the pipes. The Kandyman died shortly afterward when its external candy shell was dissolved in a pipe by strawberry fondant surprise released by the oppressed Pipe People. (DW: The Happiness Patrol)

Rebuilt
The Doctor encountered the Kandyman again on the planet Tara. Count Grendel rebuilt the Kandyman after its charred remains crash landed on Tara. (VD: The Trials of Tara)

Behind the Scenes

 * Steven Moffat jokenly said that The Kandyman was to return as the main villian of Matt Smith's first series