A Group of Zerglings � It's the first location in which you'll encounter the Zerg. To reduce your casualties, you can use the illusions of your soldiers created by Tassadar. Remember to send the phantom in front you main force, as it will deal no damage,
Marines #1 � Every Terran you encounter in this mission will join your forces. You'll encounter your first group of Marines here.
Marines #2 � Before you get to the room with trapped Marines, you'll have to defeat some Zerglings and Hydralisks.
Room with Zerg � In addition to standard Zerg units, you'll also find an Infected Terran inside. Take him out first and from a distance, as he likes to explode. Use Psionic Storm or create an illusion of your main character and send it towards the Terran to bait him.
Buried Zerglings � Take out this group before you proceed. The easiest way is to send one of the Marines to lure the enemy and have Tassadar cast a Psionic Storm on his position as soon as the Zerglings swarm him.
Teleport � Sending any unit to this marker will activate the teleport, granting you a few units worth of Protoss reinforcements.
Marines #3 � This group of Marines will be engaged in a battle with a horde of Zerg. Approach the group with Tassadar and use Psionic Storm right in front of Terran positions. Then, immediately retreat towards the crossroads and leave all your Marines here before you proceed through the corridor.
Switch � You'll have to approach this marker to open up the door leading to the next section of the base. You'll encounter an Infected Terran on the way. Use only your Protoss to push through to the switch. In this section of the base, the Terran units will draw unwanted attention from enemies from outside the map.
Long Corridor � There are as much as three Infected Terrains in this locations. Use the Marines to take them out, saving Tassadar's energy. You can also send in a Dragoon, as either way he'll be unable to climb the narrows stairs at the end of the corridor.
Marines #4 � The room blocked by a large group of Zerg, including one suicide unit. Inside, however, you'll find not only Marines but also Firebats and a Ghost. You'll use on the last stage of this mission.
Defensive position against the Zerg � Place your units in this corner. Once you pass the corner, a large swarm of Zerg will attack your forces. Initially only Zerglings, they will be followed by more powerful units. Simply continue casting Psionic Storms in front of your forces to efficiently weaken the enemy.
Switch #2 � You'll have to activate this marker to open up the door leading to a group of trapped Protoss. Once you enter this room, the security system will go online, activating hidden turrets around the base.
Mission Objective � Once you open the door, just approach the marker with any of your units.