The only melee combat achivement I still need is the one where you have to warp in a zealot from an infested gateway. Only problem is, I don't know how to infest buildings! I thought infestors did the job but apparently not. Any ideas?
"I have thrown several algorithms at this ***** and it simply refuses to boot." --Krycek18
Like Mort said, you need to parasite a probe and do the whole building order thing. Good thing is that the probe only has to start the nexus. As long as it finishes without being destroyed, you just got yourself a protoss starter set while playing zerg.
On a different note, the "infestation" ultra talks about, seems like the overseer's ability to stop unit production. It's a whole different kind of infestation.
Et ait illis venite post me et faciam vos fieri pescatores animus.