The stereotypical little grey man, these aliens are the ones who fly the saucers that everyone sees.  More information on them can be found in the Darkmatter book.

Grey
Small Humanoid
Hit Dice: 1d8-2 (4 hp)
Initiative: +1
Speed: 20 ft.
AC: 12 (+1 Dexterity, +1 Size)
Attacks: Slam +0 melee; Firearm +4
Damage: Slam 1d2-1; by weapon
Face/Reach: 4 ft. by 4 ft.
Special Qualities: Lowlight Vision 
Saves: Fort +0, Ref +1, Will +3
Abilities: Str 9, Dex 12 , Con 6, Int 14, Wis 12, Cha 10
Feats: Psychic(contact), Psychic(datalink)
Skills (ranks only): Concentration +6, Firearms +2

Special Qualities:
Lowlight Vision: can see vert well even in low lighting.