Dalek Supreme (Return to Skaro)

A Dalek Supreme who resided in a large nutrient tank rather than a conventional casing was the ruler of the Daleks who survived (AUDIO: Return to Skaro) the Thals' invasion of the Dalek City (TV: The Daleks) by hiding in a secret level of the City; (AUDIO: Return to Skaro) the original leader of the City Daleks, the Glass Dalek, had been seemingly killed when its casing was shattered in the original Thal assault. (PROSE: Doctor Who in an Exciting Adventure with the Daleks)

Behind the scenes

 * Though it does not confirm it, Return to Skaro's account of this Dalek City leader as being devoid of a casing of its own, instead inhabiting a large tank, may point towards this Dalek Supreme being the same individual as the Glass Dalek who ruled the City during the Doctor, Ian, Barbara and Susan's first trip to Skaro and whose casing was destroyed in the Thal attack.