Lex wanted to test his new cloning technology before he used it on Superman, and Powergirl was the perfect candidate. The technique was not perfected yet and what stepped out of the machine was part kryptonian, part machine. It immediately flew off and found it's twin. Powergirls mind did not last long against it's formidable mind control powers and soon she was at it's bidding, ready to create more roboclones of other heroes...