This strategy gives you no possible way to defend against an attack, other than your mutalisks, but it is the fastest way to rush your enemy with them. If done well, you can kill your enemy before they even attack you or get air D. I’ve completed this strategy in a mere 6 minutes.

1. Scout with your overlord for the enemy base.
2. Put all drones on minerals.
3. Make 2 drones and put them on minerals.
4. Make another drone and make an extractor with it.
5. Make 2 more drones for minerals.
6. Make 1 more drone for gas.
7. Once you have about 180 minerals, take a drone from your mineral field out in front of your hatchery and build a spawning pool with it.
8. Make another drone and put it on gas.
9. Make 1 overlord.
10. When your spawning pool is done, immediately go to lair.
11. Make 5 drones in this order: 1 for an extractor, the next 2 for minerals, and the last 2 for gas. If the map only has 1 geyser, make the first drone into a sunken.
12. Once your lair is done, build a spire next to your spawning pool.
13. Make a hatchery right next to the spire.
14. Make 3 drones for minerals and then 2 overlords.
15. Once your spire is done, do the following: upgrade air attack, and build 8 mutalisks in succession. You can attack once you have the mutas, or you can continue:
16. Make 2 more overlords.
17. When the overlords are done, make 2 drones for gas, 2 for minerals, and build 4 more mutalisks.
18. When you have 12 mutalisks, attack the enemy directly over their mineral field.
19. Continue building more mutalisks and sending them to the enemy mineral field; when you need to build overlords, build them 2 at once rather than 1. This saves time and uses up excess minerals that sit in the bank.
20. Upgrade Air Attack again for stronger mutalisks, unless your enemy is already close to death.

CreepColony's Opinion: It's quite possible that your opponents will have air defense. This is best used to backstab comp stompers.