Sontarans

Sontarans are a nasty race of slimeballs from the planet Sontar. They say they're good warriors, but this is only because they use a special emmision field which renders enemy guns useless.

They waged war against humanity and massacred the soldiers of UNIT (United Nations Intelligance Taskforce). However, UNIT eventually learned to use copper-coated bullets which prevent the Emission field from breaking their guns. This soon lead to the Sontarans themselves being massacred.

They use cloning to reproduce and because of this they all look th same. They try to wage war on people they cant defeat, like the Daleks, the Humans, and pretty much everyone else.

Youtube Clip
http://www.youtube.com/watch?v=WneyWA-1HPY