Matrix is a shape-shifting being from a Pocket Universe who becomes Supergirl. She was created by the good Lex Luthor of her reality, who patterned her after his deceased love Lana Lang and gave her the physiology of Superman, leading her to become a member of the Superman Family. This also caused her to pursue a romantic relationship with the mainstream Lex Luthor, Jr., although he was later revealed to be evil. Eventually Matrix merged her body and powers with Linda Danvers to gain humanity, transforming them both into a new Supergirl. Matrix was created by John Byrne, first appearing in Superman (Volume 2) #16. (1988)

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