Mike Zelby was a mobster who learned that Dr. Forbes had discovered gold in Alaska. When Forbes refused to divulge the location of the gold, Zelby had him shot and left in the harsh Alaskan climate. Clinging to life, Forbes stumbled across the home of Jack Frost who vowed to track down Zelby and avenge Forbes' death.
Zelby by this time had returned to New York City, where the local authorities were unable to prove he had murdered Forbes. Zelby next targeted Forbes' daughter Alice, kidnapping her and taking her back to his home. There, he threatened her life in order to learn the location of the gold. He never learned its location as his interrogation was interrupted by Jack Frost. During the course of the battle against Frost, a fire started in Zelby's office. Jack Frost and Alice escaped, leaving Zelby and his minions to burn alive.
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