Thin Men are unnervingly human-looking aliens who apparently serve as infiltrators for the invaders. They have short black hair and wear blue suits. While they might initially pass as human, their elongated bodies and unnatural flexibility betray their true nature. Closer inspection also reveals several patches of mottled green skin around their wrists and neck, and reptilian eyes hidden behind black sunglasses. They are very agile, capable of covering great distances in a single turn.
Viper - This female reptilian alien is a deadly combination of strength and speed. This is the true form of the Thin men from Enemy Unknown.