Quarsian

The Quarsians are aliens that experts in constructing androids. (DWBIT: The Diamonds of Sartor, Quarsian Mission, Android of Death)

Biology
They resemble clumsy upright walking blobs with two eyes which are on top of protruding stalks.

Technology
Their androids varied from simple 'storm trooper' soldiers, to robotic facsimile copies of people.

History
A group of Quarsian pirates have raided the colony of Sartor. (DWBIT: The Diamonds of Sartor, Quarsian Mission, Android of Death)