The Disruptor Dalek was a rare Dalek variation who fought in the Time War and an early time weapon. Leela described it as a big, grey and black Dalek, and compared its top with a glass ball.
During the Battle of the Pillars of Consequence, the Disruptor Dalek faced Leela and shot her, its shot making the sound of a staser. This caused Leela to be displaced from time and space. (AUDIO: The Lady of Obsidian)