Superman #656

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A Soviet base in Kazakhstan is abandoned after Subjekt-17's attack, and Dr. Llewellyn discovers he was an alien baby, experimented on for decades by the Soviets. Superman buries the alien deep underground, giving him time to free trapped soldiers. As Clark returns to an airport terminal for his flight, Subjekt-17 (now flying and speaking English) attacks, telling Superman he will punish humans for what they did. Dr. Llewellyn tells Superman the Soviets controlled the alien with sonic frequencies. As Superman tries that, Subjekt-17 is teleported away by Arion, who confronts Superman.