How about a sequel based on the last scene in "Aliens" (Alien 2)? our brave space marines return on their battle station taking with them the "mother of all Scay-gers" hidden somewhere in the space-craft.
50 missions to defend the bridge, the reactor room , find the nest and destroy all remainig ennemies.
By the way, could someone tell me how to get kill the "Einsteins"? Even with DF, it eats all my ammo and it's doesn't really seem to slow them down!
There really killing me in the mission pack.