Jackson, Solid. “Professor Xerxes Herakles Jackson, known as ‘Solid’ to his intimates, never thought he’d owe his life to his two year old nephew...but then, neither did he ever think he’d have to strain all the resources of his scientific, criminological knowledge to discover how a venomous killer could melt through solid walls!”

First Appearance: Jeep Comics #1 (R.B. Leffingwell), Winter 1944. 1 appearance, 1944. Created by ? and Paul Gattuso.

 

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