Zeg

Zeg was a Dalek who conducted experiments to strengthen dalekanium when his laboratory was struck by an Oquolloquox. The accident exposed him to radiation and bonded metalert to his casing. Although he was made stronger and more durable, his brain cells were affected and he challenged the Dalek Emperor for supremacy. To decide who should lead the Daleks, Zeg and the Emperor had a duel. Although Zeg survived acid and mercury, the Emperor destroyed him with liquid oxygen. (DC: Duel of the Daleks)