User blog comment:Bionicleboy3000/Metal Sonic: The most overpowered robot in fictional existence?/@comment-477304-20130107161842/@comment-115265-20130107225938

Well, I dunno about that... Metal Madness/Overlord was most likely a trick he was able to pull using a copy ability he obtained. I'm pretty sure he would not have been able to simply absorb space ships on a whim before he had such an ability.

And if you recall, Overlord required a super form to defeat. That makes a difference in my book.