Published
July 1968
Cover Price
$0.12
Pages
36
Mr. Cipher, who is a robot with a bomb inside, demands to "live" with the Kents and holds them hostage. He's armed with Kryptonite and has already attacked a dam. Worse yet, another Cipher robot has invaded Lana Lang's house. Can Superboy find out who is behind these evil robots and diffuse the bombs?
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