TEXT: A Scenario For STAR LEGION: The Game of the Space Opera
  By Jeff Cook
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  By Jeff Cook
  The Premise: An alien has come aboard the ship; an alien predator that becomes more powerful
  and intelligent with every kill it makes!  Can the characters stop it before it kills them all and makes it
  to civilization?
  The Setup: The PCs are all part of the same group, anything from merchants to marines to
  criminals. The only requirements are that they must be on the same ship with no escape vessels; and
  one and only one must be an extraordinary pilot.  No one else is permitted any piloting skills related to
  their spacecraft.  They have just left an apparently uninhabited world for reasons appropriate to their
  jobs (exploration, salvage, mining, setting up a listening post, etc).  Now they’re headed towards
  civilization.  What the characters don’t know is that the world was inhabited, and now they’ve picked
  up one of the world’s native predators as a deadly stowaway.  At first, it’s just hunting and getting its
  bearings; with some of its special abilities, however, it soon sets upon a new plan: kill the pilot and
  take the ship back to civilization where it can escape and hide among a ready supply of food.
  The Alien: It’s a tough bugger.  It’s strong, tough, fast, hideous-looking, stealthy… you get the point.
  It has a couple unique abilities worth noting.  First, it doesn’t show up on scanners of any variety at
  all.  Second, it can perfectly mimic any sound it hears, down to fine detail.  Third, and worst, when it
  kills someone, if it eats the brain (its favorite food), it steals the person’s knowledge and skills. The
  more it kills, the tougher it will be to defeat.  After its first kill, it will know how to work any technology
  aboard; know to stay near banks of important equipment so no one can use heavy weapons against
  it; know the layout of the ship; and speak all languages the dead character knew.  From then on its
  goal is to kill the pilot and eat his brain so it can fly wherever it wants to, and then kill off any
  stragglers so no one can warn anyone.
  The Ship: Make sure there’s lots of room and tons of hiding places.  Tons of catwalks and
  crawlways.  Think the Alien movies for visual influence.  It’s dark, damp, and creepy, even when there
  ISN’T a homicidal alien creeping about.  It doesn’t have an autopilot; that would make it too easy on
  the characters.  Oh, and make certain they can’t communicate with any other ship; it’s not fair if the
  characters get help or assistance.
  The Hunt: The best way for the characters to realize that something is amiss is by giving the alien
  someone to feed on.  (Because it’s so early in the game, I’d give it an NPC to munch on.)  That gives
  the alien enough intelligence to make it dangerous, and it makes the remaining characters wonder
  where the missing person has gone.  Try to keep the pilot alive until the players start to realize what’s
  going on.  He’s their only way home, and they have to try to keep him alive.  Make certain the
  creature is usually seen near important ship components, which makes it more difficult to use heavy
  weapons on it.  This thing is tough, and smart, and it will use every advantage it can get.  They’ll also
  need to be smart, and use teamwork.  Overall, pull no punches; they’re going to have to win or lose
  this one honestly.
  The End: This story can have several different endings, depending on how the game is run.  They
  can defeat the creature and go home, possibly with a valuable specimen in tow; they could defeat the
  creature at the cost of destroying their engines (I warned you against using heavy weapons); the alien
  might win and be heading for a major starport; or everyone can die due so some sort of heroic self-
  destruct or somesuch.  With luck and intelligence, the players will defeat the alien and head for home.
  Good luck!
  
SOURCE: textdata/thevault/Star Legion/Star Legion The Intruder.pdf