Who is Supergirl?
There have been several Supergirls over the years. A pocket universe with a duplicate Earth was attacked by three supervillains from that universe’s Krypton. That universe, however, had no Superman nor other superheroes because its sole protector – Superboy (see Q27) – had died years ago. The Lex Luthor of that universe was a good-natured heroic genius, however, and he not only led the resistance forces but also developed a special weapon. Lex Luthor invented a substance called protomatter and used it to fashion an artificial life-form (known as Matrix or Supergirl) to fight the villains. Lex eventually sent Supergirl across dimensional boundaries to enlist the aid of Superman, and the two superheroes returned to her universe. The two heroes stopped the villains only after the evil Kryptonians had destroyed all other life in the pocket universe. Supergirl then returned with Superman to his Earth, and Clark left her with his foster parents. After some psychological problems, Matrix left
