Transformers: Fall Of Cybertron Walkthrough Part 22: Megatron Returns Part 1
As the next mission begins, you will find yourself still playing the Decepticons, sneakily trying to ressurect Megatron and usurp Starscream's new, inept rule. Hit X to summon Laserbeak to grab a TechVolt power source for you. Pick it up and blast the columns to the right and the left to infuse them with power. With power restored, grab the lever to the left of the central console and follow the onscreen instructions to pull the arm into contact with the body. Be sure to attach them when the laser is white, otherwise the connection won't work. Do the same for the arm on the right.
With the arms connected back to the body, hold X to summon Rumble. Watch as he tosses aside the small debris and hunts for Megatron's head. He'll eventually find it above, and a claw will pop up and attach it to Megatron's body. With the bad guy's body restored, you just have to blast his body with energy to bring him back to life. Who knew it was that easy?!
You will now find yourself looking at things from Megatron's perspective. Still shackled, Megatron's first goal will be to break free. As Starscream announces his intentions over the loudspeaker, hit the right stick to escape from your bonds and walk freely among your followers again. Pick up the Riot Cannon by the door and blast right through the door. Proceed through the prison cells and out the door on the other end of the hall. Blast the door avoe, and hit LB to hover up to the next level. Note when you disengage your hover move that you will create a shockwave every time you come back down to the ground. Head to the right side of the next hall and grab the cash from the right side of the area before proceeding towards your waypoint.
Pick up the Riot Shield blueprint from the table ahead, and ride the elevator up to the next level to confront Starscream.