Mission 10: Eye of the Storm
Destroy the Overmind
Raynor, Tassadar and Fenix must survive
You now have command of two armies: one Terran, one Protoss. Both will need to be heavily defended to ensure your survival. Once the bases are secure, begin construction of your fleets. You will need 12 Battlecruisers, 12 Carriers, 4 Arbiters, 2 Observers and 2 Science Vessels. The first fleet is the Protoss fleet of 12 Carriers, 2 Arbiters and 2 Observers. The second fleet is the Terran fleet of 12 Battlecruisers and 2 Science Vessels. Feel free to send any ground forces you can spare for the assault, but when fully upgraded, these two fleets should be enough.
Pick a rallying point in between the two bases. The fleets will be most effective if they work together. Not much will stand up to 12 Battlecruisers and 12 Carriers moving in on the same target.
The key to this mission is defense. The Zerg will slam you with rush after rush. Fortunately, Terrans are excellent defenders. Feel free to send a few Siege Tanks to the Protoss side and a few Reavers over to the Terran side for added defense.
Send Probes or SCVs to the northeast and southwest corners. Both have huge resource caches which remain untouched by the Zerg. Defend them lightly and begin harvesting their resources as soon as possible.
Once your two fleets are assembled, build 12 Marines and send them ahead of your fleets into the fray. Don’t worry, their job is to get chewed up and draw fire away from your fleets, allowing them to punch a huge hole in the enemy defenses. Alternatively, you can also bombard the outer Zerg defenses with nukes and Yamato Cannon strikes. The Overmind is surrounded by four large Zerg hives. Destroying at least two (preferably all) of them, you will make the final push much easier.
Destroy a Zerg hive (any of them), then retreat to rearm and replace any losses. Once you are ready, head back in and destroy another. Defenses are very heavy, but are relatively easy to overcome with your giant fleet. Destroy at least one more hive, then retreat and rearm again. Save your game.
There are two further options. One is to unload ALL your units and throw every single one of them at the Overmind. This is risky, but makes for a really cool fight, even if you lose. The other option is to do what you’ve been doing: destroy a Hive, retreat/rearm, then destroy the next. This is safer, plus it allows you to destroy the Overmind all by itself.