Supreme Dalek

Overview
The Supreme Dalek is the second in command of the Dalek Empire after the events of the Time War. It oversees major Dalek operations and answers only to the Dalek Emperor. It is flanked by two Supreme guards which are identical to Council guards but with a gold dome.

Characteristics
The Supreme Dalek is designated from other daleks by a black casing with gold bumps, trim and solar panels. It also has a shorter eye stalk with enhanced visions circuits. It commands Dalek operations from Skaro but oversees major operations itself. Its subbordinate is the Red Dalek, commander of the Supreme Council. As the Cult of Skaro could, in grave emergencies the Supreme dalek can Emergency Temporal Shift back to Skaro.

You may be thinking of the Supreme Dalek, commander of the Daleks before the events of the Time War.