Well, my idea is a sort of glimpse or montage of Namor growing up during the opening credits to explain his origin much easier. Then we see Namor in Atlantis on the run from some sea-barbarians led by Lord Attuma. Attuma and Namor have a short battle and Namor is launched out of the water as he lands on a dock. He gets amnesia and tries finding out where he is. So, he spends most of the time in the movie wandering the streets. Later, a tsunami rises and Attuma comes out riding a humongous sea-monster, and then it all comes back to him. Namor has to find Attuma's castle and free his enslaved cousin, Namora, so the two can stop Attuma.
Here's the main event... the cast!
Prince Namor - Zachary Quinto (Star Trek, Heroes)
Namora - Kristen Bell
Lord Attuma - Wesley Snipes
Namor's Dad - Tobin Bell
Namor's Mom - Helen Mirren
Well, they're you are. Any suggestions or ideas to improve it are welcome, just no trolling or being rude!