Karl Helfern (Prime Earth)

Doctor Karl Helfern was a scientist working for Wayne Enterprises. Hired by Lucius Fox, along with fellow doctors Bill Kelver and Del Paji, he was known as the smartest among the group, working with nano-medicine to try and create a serum to make human bones harden upon impact to prevent breakage. The experiments were a failure and, presumably, led to his decreasing mental stability. Some time after being fired from the company, Helfern took up the mantle of Doctor Death, killing the other members of his research group by injecting them with his failed formula, causing their bones to grow uncontrollably and rip them apart from the inside.

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Karl Helfern (Prime Earth)

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