Scientist Dalek (The Guide to the Dark Times)

A unique Scientist Dalek was a member of the Time Squad, a battalion of Time-Sensitive Daleks deployed by the Emperor to attempt to make history more favourable to the Daleks after a divergence in the timeline was detected, (PROSE: The Guide to the Dark Times) which rewrote time, making it so the Daleks had not fought the Last Great Time War. (COMIC: Defender of the Daleks)

Physical appearance
The Scientist's casing was a unique Dalek variant: it had the broad design of a Bronze Dalek but had a dark, gunmetal-grey base unit and grating section, and a crimson dome, sense globes and slats. Its eyestalk's lens was a bluish white with small green, yellow and blue lights surrounding it, while its luminosity dischargers were yellowish. Instead of the familiar plunger-like structure, its manipulator arm ended in a six-fingered "claw". (PROSE: The Guide to the Dark Times)

Psychological profile
Melody Malone described the Scientist Dalek as "a whizz with temporal science". It was not only time-sensitive, but had a strong sense of how actions could affect both the future and the past, allowing it to use "time itself" as a weapon when devising "new and unusual plans" in conjunction with the Dalek Prime Strategist. (PROSE: The Guide to the Dark Times)

Behind the scenes

 * Speaking of his portrayal as the Scientist, Nicholas Briggs described him as "very very picky and pedantic".