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The Captain was a feared space pirate who ruled the planet Zanak, assisted by his nurse and Mr Fibuli. He also had a pet robot parrot, Polyphase Avatron.
The Captain commanded the Vantarialis until he crash-landed on Zanak, where he was rebuilt as a cyborg. The Captain designed the transmat engines which allowed Zanak to materialise around other planets and plunder their mineral wealth. He kept the super-compressed remains of those planets in his trophy room. The Captain’s nurse was actually a projection of Zanak’s former queen, Xanxia, who controlled the Captain and used the energy from the planets to become immortal. After Calufrax was plundered, the Fourth Doctor investigated. With the aid of the Mentiads, he fought the Captain, preventing him from attacking his next target: Earth. Xanxia killed the Captain when he turned against her. (The Pirate Planet)
The Captain was among the foes who the Fourth Doctor saw call out to him in his mind shortly before his fall from the Pharos Project radio telescope, which resulted in his regeneration to his next incarnation. (Logopolis)
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