Purzithroan Vagabond

The Purzithroan Vagabonds, from the Ambient Expanse, were a gang of ruthless pirates whose bodies were often grafted to cybernetic parts giving them greater strength and patching up their damaged bodies. Their ‘crest’ was a half cybernetic head. They were a largely undisciplined bunch who, for a while profited by stealing seeds held in storage in the Terran Seed Vault in Norway on a solar ravaged Earth of the future. They fled the vault after being scared off by holographic images (believed to be ghosts), and warnings created by the Eleventh Doctor and Amy Pond from the control room in the Vault.

(DWAM: Pirates of the Seven Seeds)