You will begin this mission as a typical Decepticon soldier, heading down below to investigate a power disturbance. Follow your ally down the ramp and shine your light on the console so that he can open up the door ahead. A small flash will happen in the corner as you enter the room. Before you know it, your ally will be getting gutted by a sword from some invisible assailant. Starscream will soon come into view and whip out his sword. Click the right stick in to execute the second soldier. You will now be in control of Starscream.
Head up the ramp to get back upstairs. Sneak up behind the guard at the console by your waypoint, and hit X to plant a charge on the poor guy's body. Head through the door and sprint up to the enemies ahead. You will be equipped with a Scatter Blaster, meaning that you will have to get in close to the enemies to be effective. Combine it with your sword to kill the enemies faster. Head up to the console and plant a hacking charge on it. From here, fransform into a jet and blast off towards one of the multiple waypoints on the horizon. Two of the areas will have walkways leading inside of the control rooms, you can sneak into these rooms by activating your ability, which is a cloaking device, and waiting for the enemies to patrol right past you. From here, you can sneak inside, kill the lone guard, and plant a hacking charge on the console.
The third area will be a little tougher to get into. There is no immediately accessible path to get in through the front door, so you will have to fly over and land on the roof and drop into the hole in the ceiling. Sneak past the enemies, plant the charge, and fly back out through the ceiling.
After hacking the first three areas, two more will pop up to the right. Fly over the vast wires to the right and head over to the series of floating platforms. Cloak yourself to get past the patrolling Decepticons ahead. Wait for the final one to turn his back before sneaking up on him and planting a charge on his head. Grab the audio log from the right side of the room, plant a charge on the final guard's head at the back of the room, and hack the console. Leave the room. You will run into a few enemies, who will be alerted to your presence now. Blast through them with your shotgun, or hover in vehicle form and pepper them with fire from afar. Fight your way to the final console, dropping in through the ceiling to reach the final console. You can also grab a heavy weapon from the console ahead. This will be a Cyber Corruptor, which will allow you to turn enemies against their allies.
After hacking the final console, a group of Seeker enemies will come up and scan the area with their lasers. Wait for one to turn its back, and then stealth kill him. You pretty much can't help but get into a firefight here, though. Sprint into the area ahead and blast the enemies in the room with your Scatter Blaster before they even know what's hitting them. Head through the lower portion of the room ahead and smash up the crates to the side as you go.
You will find the final EMP charge point here. Plant the charge and the windows ahead will lower. Use the store quickly if you need to, and then fly out the windows amidst the barrage of rocket fire that you will undoubtedly be taking from the enemies on the ledges ahead. Hover strafe past them and blast them with your heavy weapons. Fly towards your objective, heading into the tunnels. You will have to avoid the lasers shooting out of the sides of the tunnel, so be careful even as you fly past them all. When you land, you will see Shockwave lurking below you. Proceed through the ducts and fly up higher, avoiding the electrified pipes ahead. Double back when you land, and drop through the circular hole in the floor. Skirt around the arena below, watching as the Decepticons torment Grimlock. Approach the Decepticon manning the controls all the way to the far left. Hit X to place a charge on him, but watch out; this guy won't be as easy to fool as the others.
You will be thrown to the floor below. As you land, hit the detonator to blow up the guard regardless.
This will mark the shift between Starscream and Grimlock. Hit X to play as Grimlock. Click in the right stick to attempt escape as Starscream talks down to you. Finally, hit the melee button one last time to grab Starscream and hurl him across the room. Break free of the metal shackles and approach the double doors ahead. Hit the X button to pry open the doors and walk up to the two guards ahead of you. Hit the B button to melee attack the enemies, killing them, and break through the doors with your melee strikes. Proceed down the hall wildly swinging your swords, and then grab the explosive tank ahead. Hurl it through the door ahead, and then proceed down the hall towards your waypoint. At this point, you can simply slash through all of the enemies in your way without worrying about health. If you do want to defend, hold down the left trigger to raise your shield.
In the next room, you will be assaulted from the circular catwalks above by a bunch of rocket troops. Hold up your shield to block the rockets and protect yourself from all damage they would inflict. Climb up the ramps and hack and slash with your sword, taking out the rocket enemies with ease. Climb up the ramp and outside. Here you will find an explosive crate. Grab it and toss it to the other side of the broken bridge to raise the bridge ahead of you. Hit X to pry open the door ahead. When you enter the room ahead, you will find Swoop trapped in a test facility. You will have to save him in the next checkpoint.
