Skishtari

The Skishtari were known as one of the most fiendish race in the universe.

Biology
The Skishtari laid dormant eggs among the populace of inhabited worlds. Skishtari eggs took thirteen years to hatch. They had very sharp tongues. (AG: Tsar Wars) Skishtari eggs had a psychic link with their host. (AG: Aladdin Time)

Technology
Travelling through wormholes was second nature to the Skishtari. (AG: Tsar Wars)

History
In 2011 the Fourth Doctor said that the Skishtari had ransacked planets in the galaxy for many decades. (AG: Tsar Wars)