Superman #650

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Luthor is cleared of all charges, but the people have lost respect for him, and he resents it, holding up a crystal (the sunstone). Dr. Abernathy experiments with Kryptonite on animals: one breaks away and causes an explosion that turns him into a Kryptonite Man. Clark sets off a signal watch that summons Supergirl, who defeats the Kryptonite Man. Luthor's goons take Clark to Luthor, who tells him \"No more stories\", and threatens Lois. Clark tells him \"You're finished\", as Luthor punches him out and kicks him down, leaving a bloodied Clark behind, who has obviously lost his powers.