In the spirit of turning a comment into a post I give you my idea for how you would take Prince Namor from the Captain America movie to his own franchise. This one kinda is a no-brainer if you rely on what already has been done in the comics. No need to change a thing. Just make it all so much bigger and cooler.
"I would totally see how the transition from Cap's movie to Namor's movie would go. After the war, Namor returns to his beloved Atlantis to find it in ruins and goes off his nut blaming the surface world for the destruction because of 'their' war and waring ways. He feels especially betrayed because of the actions he took to save the surface world from the tyranny of the Nazis.
Then he discovers that while protecting the Allied shipping lanes from the Nazi U-Boats, he himself may have unknowingly caused the destruction by being reckless.
This makes him more crazy and angry at the surface world. Only we know he is being manipulated by powerful enemies, both Atlantian and Human/Nazi. It is ALL personal and all about revenge.
Here is where you add the fight between him and the original Human Torch, his old war buddy.
You would make Attuma the main villain who does the old switcheroo at the end to side with Namor and Atlantis against the evil humans.
Then you have him lose his memory at the end and he is ready for the sequel which begins when Johnny Storm (the FF Human Torch) finds him and restores his memory and we are off again.
Cut and Scene"
