Pting

Pting were an alien species in the 67th century. They fed off on energy in order to survive. They were a vicious species, able to consume any non-organic material (including the Doctor's sonic screwdriver) making imprisoning them impossible and confining them to small areas dissuaded. However, they did not consume anything organic, like human flesh. One of them snuck aboard a hospital ship in an attempt to consume it's anti-matter power core only for the Thirteenth Doctor to stop them. (TV: The Tsuranga Conundrum)