Futurekind

The Futurekind were a species of humanoids who lived on the planet Malcassairo.

Biology
The only obvious difference between the Futurekind and the Humans who took refuge on Malcassairo was that the teeth of the Futurekind were jagged and sharp; capable of cutting into flesh. The guards at Silo 16 on the planet needed to check the teeth of all who tried to enter the base in case of an infiltration of Futurekind. The Futurekind also had hissing voices. (TV: Utopia)

Technology
The Futurekind were a primitive species that possessed little technology. They wore simple animal skins and hunted with primitive spears and makeshift weapons, such as a double-ended flail.

They also tattooed and cut themselves in various patterns. (TV: Utopia)

History
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 Utopia, they themselves would evolve into Futurekind, implying that the Futurekind were mutated Humans. (TV: Utopia)

After the Humans had left Malcassairo, the Futurekind entered Silo 16, where they chased the Tenth Doctor, Martha Jones, and Jack Harkness. However, the three of them were able to use Jack's vortex manipulator to escape. (TV: The Sound of Drums)