Krattorian

Krattorians are an interstellar race of humanoid slave traders who travel in saucer-shaped spacecraft, enslaving members of other species and also seeking out other products to trade.

History
Soon after the rise of the first Dalek Emperor, a Krattorian vessel landed on Skaro and its captain, Kest, became interested in the planet's magnetic sands, ordering his slaves to collect as much as they could. The Daleks in turn pretended to ally themselves with the slaves in an attempt to take hold of the alien vessel and learn about its secrets so that they could expand their own empire into the stars.

Eventually, the slaves managed to seize the ship for themselves and take off, finally freed from their oppressors, but not before the Daleks got hold of the ship's design plans and acquired the knowledge of how to build one.

Appearances

 * The Dalek Chronicles, "Power Play" (1965)