Gigantic map.  Used consoled command to add in an extra 500 colonizable planets.  24 civs.  Godly difficulty AI.  But I cheated a bit and gave myself an extra 3 administrators at the beginning, and console modded all of my colony ships to move twice as fast, which is the bonus the AI gets.  So on average in the early game it's probably only genius difficulty, but the AI gets to keep its Godly bonus for later.  

So, anywho, I added in my custom built races.  "Zerg Strain 1" "Zerg Strain 2" and "Zerg Strain 3."  It's turn 30 or 40, and I'm at 27 colonies.  Zerg 2 and 3, like most of the rest of the galaxy is on an average of 8 or 9 planets.

Zerg Strain 1, led by the Overmind, has colonized 40 planets.  

I also made them malevolent and aggressive.  I'm benevolent.  This should be interesting.

Tee hee hee.