Krikkitman

The Krikkitmen were androids from the planet Krikkit.

A dust cloud separated them from the rest of the universe, so the Krikkitas thought that they were the only beings in the universe. After learning that they weren't (when a spaceship crashed on their planet), they set out to destroy the universe. They created androids and made ships and sent them off as perfect killing machines. It turned out this was a ploy by a bored supercomputer, Hactar. After the Krikkit Wars, the Time Lords stored the Krikkitmen in Shada. A rogue Krikkitman later freed them and set out to continue their goal, but the Fourth Doctor and Romana prevented this. (PROSE: Doctor Who and the Krikkitmen)