Metal Sonic is the robot doppleganger of Sonic the Hedgehog.  Created by Dr. Eggman, Metal was programed to rival and eliminate Sonic the Hedgehog.  However, due to Sonic's unmatching heroism, he's defeated the evil robot countless of times, having to be repaired over and over again.  This time, when Dr. Eggman and his nephew, Snively, build Metal once again, he is given the ability to warp through zones and he uses it to his advantage to find Sonic fighting Scourge in Moebius.  Will he be able to capture his primary target and bring him to his master?

Metal Sonic is obviously a robot, so not only do I want him to have a robotic sound effect, but I want him to sound very low and monotone, as if he has no heart or soul.  I would say to not overdo it, but just give me the best you can with this kind of tone.