-Make 9 drones
-Make 1 overlord
-Morph 9th drone into spawning pool
-build 6 more drones
-have 1 drone morph to extractor
-put 4 drones at extractor
-morph into lair
-make another hatchery
-build sunkens and spores
-make hydralisk pool and queens nest
-make 10 hydras
-make a queen
-research speed and transporting for overlord
-send in hydras and weaken command center
-have queen infest command center
-start pumping out infested terrans and hydras
-they will run to nearest object and explode
-this will severaly damage the enemy
-attack with hydras because the opponent will try to rebuild and will be seaverly damaged and lose his tech tree rssource flow and advanced units

CreepColony's Opinion: This will be very difficult to pull off, and even if you do infest their command center, it'll probably die pretty quickly.