I have almost finished the plan for the third army, a previously un-met alien race that inhabited the planet thelso before the humans and mutants arrived, these aliends are techologically advanced creatures, able to hide their bases with stealth technology. this is why humans and mutants have not seen them yet. their civilians cities are based underground, away from the humans who would pillage them. the aliens have waited in the dark,hoping that taking humans fomrtheir cities would maybe getthe humans to leave, but the humans ignored this fact, and the aliens have massed a huge army to destroy the humans and mutants.
the aliens (known as 'X') have 3 subclasses to go with them, they can choose stealth, speed or armour. all ofwhich gives them a different hero, a special upgrade, different type of service depot machines and a defencive structure, i dont want to let on too much though

if anyone is interested in this mod, please say so, as i will need testers etc. also, if anyone would like to join the team (hint hint)
plz reply with comments / ideas etc