Originally Posted by
Lightning Rider
To be honest, origin stories are so dime a dozen nowadays, that I would prefer a JLA movie where the league is already established, no questions asked. It starts with an action scene with one or two heroes against a villain, before one or two more show up and help out. They reference they are late for a meeting with the rest of the league, who is then shown fighting a completely different battle. Shortly after they all meet at the watchtower and casually interact with each other before having a meeting that showcases their different personalities, relationships, and approaches. In a short amount of time, you establish a world in which superheroes simply exist and this is a group of familiar comrades. A lot can be done with only a few lines and scenes.