Grey (Marvel)

The Greys are a species of interstellar grifters who had a presence on Earth from the 1960s to 70s.

Biology
The Greys are how you typically expect a them to look, large black eyes, grey skin, slits for nostrils, the works.

Culture and society
Their society is similar to an Earth mafia, their technology is scavenged from other races (similar to the Pakleds, possibly even obtaining the tech through similar methods) and this has allowed them to gain access to interstellar travel, despite their appearance, they do not abduct other species and perform tests on them, they are known for their extremely capitalistic tendencies (similar to the Vree and the Selachee).

History
A small group of Greys arrived on Earth in the 1960's, running the casino Area 52 in Las Vegas, Nevada.

In the 1970s, they came into possession of a Rigellian Recorder, following this they where expelled from the Earth by Howard Stark.