18 Awesome Aliens

Lee the Bounty Hunter, Critters 2: The Main Course (1988)
The Krites were sort of like less friendly versions of Sonic the Hedgehog, and when they banded together, they resembled a giant tumbleweed capable of devouring small Midwestern towns. Due to their blind malevolence, I can't really throw my support behind them as great aliens, but the bounty hunters who stalked them were truly badass. In Critters 2, bounty hunter Ug (Terrence Mann) is joined by a faceless apprentice named Lee, who has the ability to transform into anything he sees. When Lee stumbles upon a copy of Playboy and opens to the Playmate centerfold, he becomes the hottest alien assassin in the cosmos. There are few things sexier than interstellar vigilantism...— Chris Schonberger