Thin Man

The Thin Man is a type of alien that appears in the turn-based strategy game XCOM: Enemy Unknown. Capable of passing off as a human, this enemy serves as an infiltrator for the alien invasion force. During the events of XCOM 2, it is revealed that Thin Men were a genetically altered form of the Viper.

Description
Thin Men are tall, slender humanoid beings that are able to disguise themselves as humans. They appear as Caucasian male humans with slick, combed-over hair, distinctly large foreheads and a gaunt body structure. They wear gold-framed circular sunglasses and deep-blue business suits. While they seem to appear human, Thin Men are allegedly reptilian; the creatures have slit eyes akin to a lizard hidden behind their sunglasses and patches of mottled green skin concealed beneath their clothing. Their bodies are also exceedingly flexible; their backs and their limbs can bend in ways that the human skeleton cannot.

In combat, Thin Men are usually deployed alongside Sectoids and perform flanking manoeuvres against human soldiers. They are capable of spitting poisonous fluids at enemies at close range and use their natural flexibility to leap to high vantage points where they can get a better view of the battlefield. When a Thin Man is killed, its body will expel a cloud of toxic gas that will poison most creatures that go near it. Only other Thin Men, Chryssalids and robotic units are unaffected by this poison.