Alias Super-Thief! Superman , still suffering amnesia, comes to believe he might be Jud Blake, alias Super-Thief, a wanted criminal. He substitutes for Super-Thief for a time, but is fearful that his criminal identity might be his real “self” and his Superman identity only a sham No Mercy For Supergirl! When Supergirl tries to recover the notes left by an experimenter in diseases for the World Health Organization, she is captured by a tractor-beam wielded by an alien calling himself the Avenger. The Avenger is from the planet Sarkon, whose laws absolutely forbid taking any life whatever. For super-beings who flaunt this law, the penalty is imprisonment in the 5th Continuum. Since Supergirl has been observed cutting a flower and killing a butterfly for a collection, he sentences her to die. However, Supergirl tricks the Avenger into killing some disease germs. Convicted by his own law, the Avenger commits suicide.