Zargo

Zargo was originally Captain Miles Sharkey of the Hydrax before turning into one of the Three Who Rule.

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Like the others, Sharkey formed part of the crew of the Hydrax before the ship crossed from N-Space into E-Space. In E-Space, the Great Vampire took over Sharkey. With his former shipmates Camilla, now his consort and Zargo, now his advisor, he ruled over the primitive planet for a thousand years.

Years ago, he once pursued the group of rebels with help from his men. Zargo eventually died when the Doctor launched one of the shuttles into the heart of the Great Vampire which caused the Three Who Rule to die and decay. (DW: State of Decay)