Here's a thought –
What Superman struggled with all his life was the elements from his own home planet.
The invincible left vulnerable by even a small piece of the dirt that had birthed him, that he thought he had left behind.
What gave him strenth and ability?
Keeping himself present in his new life, surrounded by the substance and thought of a new kingdom, a purpose and a new "birth" on an entirely different plane of existence.
I don't think Superman is a study of a christ come to earth as today's new age philosophers would have us suppose.
That's not what makes him so enduring an attraction, but he really is a picture of ourselves; our own existence on our own "Daily Planet" that constantly challenges and pulls and weakens us back down to the very dust of which we were born.
Oh to be reborn on a new planet where we have the abilities to break free from the gravity of life – to soar above earthly circumstances and to see through the walls that seem to crush us from every side – the feeling of it all about to cave in on us…
Where the rules of our limitations no longer apply, but to find that we are actually born royalty of a higher kingdom.
This knowing and longing inside of us that there is a hope!
That there is something more…!
ah, the philosopher is born anew with the invention of DSL.