I think the whole movie should be set in WWII, in the style of the first part of The Ultimates. But maybe have him fight the Red Skull instead of the aliens. The ending could be just like in the Ultimates. It could end on a down note with Steve plummeting into the sea. You see him floating down with the picture of his girl floating to the top with something like please come home written on it. People unfamiliar with the story would be all sad at first. But if you stay through the credits, It could have a shield transport pulling a big block of ice out of the ocean, but you can't really see inside it. Somewhere, some guy comes up to Samuel L as Fury and goes, "Sir, we've found him." Enter the Avengers movies. It could pick up there. What do you think?