Futurekind

The Futurekind appeared on Malcassairo around the end of the universe. Little was ever known about them, except that they learned to hunt humans for flesh, as there was little else on the planet for food. There was, however, a myth amongst the refugee humans that if humanity did not reach the planet Utopia they themselves would evolve into Futurekind, implying that Futurekind were mutated humans.

After the humans had left Malcassairo, the Futurekind entered the Silo and chased the Tenth Doctor, Martha and Jack Harkness. The three of them were able to use Jack's vortex manipulator to escape. The Futurekind presumably starved to death.