Detective Comics #228
John Jones discovers that Alex Dunster, who acquires and sells scientific and technical items of great value, has gotten hold of the machine that Professor Erdel used to bring J'onn J'onzz from Mars. Jones realizes that if he uses the machine to return to Mars, however, Dunster would be free to continue his criminal ways. So Jones confronts Dunster, but Dunster destroys the machine before surrendering.
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John Jones discovers that Alex Dunster, who acquires and sells scientific and technical items of great value, has gotten hold of the machine that Professor Erdel used to bring J'onn J'onzz from Mars. Jones realizes that if he uses the machine to return to Mars, however, Dunster would be free to continue his criminal ways. So Jones confronts Dunster, but Dunster destroys the machine before surrendering.
Plot details indexed by the Grand Comics Database (CC BY-SA).