To Be Able To Build These Guys, You Must Research The Breakthrough Technology Associated With It.
- There Are Only 19 Available Breakthroughs Per Game. (Out Of 55 Total)
If You Don't Get It, You Must Start Again, At A Different Starting Location.
- Starting At The Same Location Or Restarting Your Current Map, Just Gives You The Same 19, But In A Randomized Order.
If You Happen To Get This Breakthrough, Also See:
Good Luck!