Just what do we know about the Aliens?

[Pale Rider]

CONSPIRACY LEVEL 1:  “A VISITOR” 
        CL1 takes course around the time of the movie.  A Narcissus Shuttle is towed from  Outer Reaches to Gateway station.  On the basis of the report from the survivor, a CMC Cruiser was sent to a planet on the Outer Rim.  The Aliens are only known by that survivor.  This setting is a pre-threat scenario.  Marines usually don't even consider any non-human threats in known space.  The human quotient is another story.  The Aliens still exist in deep, deep space, and on the planet Acheron, quarantined after the Atmospheric Processor there went critical. 
    EG:  Aliens -The Whole Squad
  CONSPIRACY LEVEL 2:  “IT’S ON A NEED TO KNOW BASIS” 
        In CL2, stories have leaked about some alien life form on the rim.  The PCs still don't know anything but their superiors may not be revealing everything.  Weyland Yutani and several other corporations are committed to a secret agenda.  Meanwhile in deep space, in the deepest of the deep, several ships and colonies are found abandoned, destroyed, or they simply have gone missing.  PCs may encounter trace evidence of something…deadly…something someone is trying to hide. 
    EG:  Alien 3 - Clint McKenna, Katy Bradford, Scarlet Burnside, Lt. Maria Gruber, and Sergeant Jacob Abdulov
  CONSPIRACY LEVEL 3:  “WHAT ARE THEY?” 
        CL3 reveals them finally…but who will believe you?  The PCs would have to be in deep space to encounter them.  Outer Colonies are fighting for their very survival.  Meanwhile, on Earth, no one knows a thing.  Rumors have leaked through the systems about strange infections on the rim colonies.  Corporations are directly fighting for control of the Xenomorphs biotechnology.  The CMC (or USCM) funds a secret brigade of forces sent into the rim to keep the infestation from swarming out of control.  This is a great start for some basic action and plot development. - Allen Morse, Eric Roberts, Mark Giosso, Samantha Hall, Thomas Colson

Please keep this in mind as you play your Characters. Your knowledge will far exceed the knowledge of the characters.