10 Times Superman Ruined Lex Luthor’s Life
6. Making Him Sell His Soul - Underworld Unleashed
The matter of Lex Luthor selling his soul is a profoundly complicated one.
After Lois Lane and Superman discovered that Lex had cloned himself and had his brain transferred into this body in order to pretend to be his own son, more than a few suspicions were raised as to what the man's end game was. As it turns out, said end game was to try and date Supergirl, and to try and ruin Lois' life after discovering that she had uncovered his dark secret.
As it turned out, this wasn't the only dark secret about Luthor at the time, as it would also be revealed that his clone body was rapidly deteriorating. Forced into a corner by Superman revealing who he was to the public, Luthor sought the only out he could, and sold his soul to the demon Neron in order to be restored in a healthy body.
Which you have to kind of hope Superman never found out, so he never has to think about being technically responsible for this transaction. Ignorance truly is bliss for this one.