"Metal-Lisa" and "Metal-Liza" are the possible future daughters of "Dr. Phase" and "Metallica" sent through time and space through a faulty trans-dimensional portal while looking for their lost parents only to wind up finding past versions of them and opting to stay with those past versions until they can find the actual future ones that they belong with. I came up with their names as a bit of a pun on their mother's code name when developing them as characters. I guess that I thought that while they inherited the powers of both of their parents, and even borrowed costume elements from both, that they would mostly take after their mom. Good luck telling them apart though, as they are exactly identical, but for the purposes of this bio, I guess you could say that Lisa is on the left and Liza is on the right just as their names are ordered.