We will see if you do prefer marines Tommy. Our battles today will be with me as nids in mission XI Unknown Lifeforms.
Oh, I just got an idea.
When a Genestealer destroys a Terminator, you may roll 1 D6. If the result is 1 the space marine is knocked out and is treated as an object. You cannot move through the space marine. Check the unconscious space marine rules in the mission book for details. If a 6 is rolled, the Terminator turns into a Genestealer after D6 turns. The space marine player may choose to shoot the infected space marine with any weapons (including heavy flamers). The space marine may only use 2 action points per turn after he is infected. He may not use Command points.
It's another long thing, but it uses actual happenings from Mission IV Cleance and Burn and another mission (can't remember which).
We need nid smilies for the re-release of Space Hulk.