The hollow sockets in its face filled with scowling eyes as skin seeped like ichor out of impossible pores. Dan tried not to retch at the sight of its growing form, the sound of cracking bones too visceral to bear. After several agonising seconds, it rose on unsteady legs and fixed the Doctor with a grimace; its peerless expression of unrestrained hatred bore through her hearts, and the Doctor realised, with mounting horror, that this was not a new lifeform: she’d seen this evil before…