Skishtari

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

Biology
The Skishtari laid eggs in the populace of inhabited worlds. Skishtari eggs took thirteen years to hatch. (AG: Tsar Wars) A Skishtari egg had a psychic link with its 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)