Swabb

Swabb was the first mate of Captain Kaliko on the Black Gold. He was really in league with Oil Core, who promised him a proper body. His race is unknown, but his appearance was a human skeleton. The rest of the crew of the Black Gold were the same.

Swabb turned on Kaliko when he thought The Doctor and Martha Jones were Oil Core spies. He controlled the Oil rigs to attack the ship, and it was destroyed. Swabb survived, and threatened Martha to use her body to replace his. The Doctor used his Sonic screwdriver to flip Swabb off the deck. Swabb is still alive, vowing revenge. (DW: The Infinite Quest)