Stingray

Alien Stingrays where creatures that had tremendous powers and could not control there actions on how they conducted there powers. They where named Alien Stingrays by UNIT as that they resembled Stingrays that live in Earths Sea.

Biology
The Stingrays had an exoskeleton of metal to enable them safe travel through the Wormholes they created. There digestive system allowed them to eat anything encluding metal which was usedto make there exoskeleton once digested.

History
The Avian Stingray could generate wormholes and generated one from San Helios. There they destroyed all its inhabitants and buildings. Thus turning it into a barren sandy planet. They generated another wormhole this time leading it from San Helios to Earth. The Doctor detected this and started to follow the trace on the number 200 bus. The bus fell through the wormhole and it was saved every one on the Bus. But the Bus Driver walked through the Wormhole and died coming back to Earth as a Skeleton. The Doctor and Christina de Souza manged to get the bus back to Earth but three of the Avian Stingray got back. UNIT shot at then and they all got killed. As the Doctor had got back UNIT's scientist Malcolm Taylor Closed the Wormhole so they could not get to Earth. (DW: Planet of the Dead)