Mission objectives: Destroy the overmind
Zeratul, Tassadar, and Raynor must survive.
In this mission it is vitally important that you build up numerus forces for defense at both of your bases. For the terran base you should get some bunkers with marines in them, some siege tanks in siege mode behind the bunkers, a little bit behind the bunkers build some missle turrets, and some goliathes to use against gaurdians.
For the protoss base you should build multiple photon cannons and some scouts to defend against gaurdian attacks. get a shuttel or an arbiter that knows recall tell them to go from your first protoss base to the left bottom hand corner of the map. It is better to use an arbiter. From that corner get an scv and a command center or two. Build a nuclear silo on each command center. make some attacks going up from that base. It is vitally important that you ONLY ATTACK WITH GROUND UNITS. The zerg have many scrounges that will destroy your air fleet in seconds. It is also vitally important tha you destroy any overlords that you can because they can see your ghosts alowing the enemy to destroy them. Take out the few spore colonies by the overmind so that your ghost's are safer(use nukes to do this). Destroy the small base up from your base. with nukes. Straight up from that is the overmind. There are many units and many times your ghost will be destroyed before your nuke can hit. Keep building more. If you need more gas go left froom your terran base and make a base there. If you needmore gas go the the upper-let hand corner of the map. Two zerg units gaurd these four gysers. destroy them and make a command center or two. continue you assult on the overmind but continue to make sure that your defenses are strong at very base. sooner or later the overmind will take a nuke or two that's the end of the mission.