User blog comment:BatmanBaleLover/Ridonculous Race Impressive Theory: Space season with time-travel ? (Important, read!)/@comment-24152851-20140622100939/@comment-24152851-20140622205140

Grey aliens are an alleged real life alien, and they are the most common species encountered by people who have had "encounters" or are abducted by UFOs. They are characterised by their grey skin (hence their name), large round heads, large pupil less eyes, short stature, long thin arms legs arms fingers.

Roger from American Dad, and the main character of the Movie "Paul" are examples of Grey aliens.

Oh and probably don't click on the link if you're squeamish.