My trilogy:
Justice League
Superman/Clark Kent: Brandon Routh
Batman/Bruce Wayne: Christian Bale
Wonder Woman/Diana Prince: Catherine Zeta-Jones
Flash/Barry Allen: Colin Ferguson
Green Lantern/Hal Jordan: James Caviezel
Martian Manhunter/J'onn J'onnz: Robert Patrick
Lex Luthor: Kevin Spacey
Vandal Savage: Gerard Butler
1st movie: Centuries ago, we're given a brief introduction of Vandal Savage and his history. He later grows to become the would be conqueror of Themyscira (which has just recently bcome involved with Martians who have supported them with technology). Vandal tries to seize their powerful weapon, but is stopped and hides decides to move on to other things for now. Modern time, Lex Luthor has recently been announced President of the US and Vandal Savage is Secretary of Defense. Meanwhile Clark has been having strange visions lately. He goes to have lunch with new friend Bruce Wayne (towards the end of their conversation, it is revealed to the audience that their secret identities are known between them do to a previous meeting which can be explained in a later "Batman VS Superman" flick).
Clark tells Bruce about the dreams, and as they get stronger, they go to investigate. Meanwhile, Ambassador Queen Hippolyta and her daughter Diana Prince of Themyscira are contemplating the US on whether or not they should become allies after it's existence has been revealed long ago. During this, clips of former police scientist Barry Allen (who is working in a lab designing a way to run at super high speeds after discovering the Speed Force) can be shown, as well as clips of fight pilot Hal Jordan (whom already has his ring but doesnt know exactly what to do with it).
Superman and Batman go to investigate the dreams and see that they are coming from the Martian J'onn J'onnz. They help him escape a government testing site and he tells them the story of Vandal Savage after discovering that the man wants to try and open war between Themyscira and the US to retreave the weapon.
Superman and J'onn (now in a different form) talk to president Luthor, who has already had a talking to with Vandal (the two are secretly already working together). The president starts war between the Amazon Island and begins rallying troops and he also drafts Superman, J'onn and Barry Allen joins the fight (now powered by the Speed Force...he designs his own costume to withstand the new speeds, as well as "fit in"). Joining them as well is fighter pilot Hal Jordan, with the power ring of course. Upon reaching Themyscira, they're attacked by scouts (one being Princess Diana).
Meanwhile, Batman is busy battling Vandal Savage who has begun breaking out a number of criminals from prison to help him as he double crosses Lex to seize the weapon for himself. the heroes on Themyscira are defeated and quickly return, with Diana following. They all apologize for the battle, and then they talk. Soon, Lex brands the heroes as traitors to the country and wanted men (and women, including Diana). After meeting up with Batman, they figure out they must band together to stop the war.
The Amazons declare war, and when Diana declines helping, she is branded a traitor as well and the heroes then begin to fight both sides as war finds its ways to the US (Hal dons a costume resembling that of Abin Sur, and Diana creates a costume out of the American flag to gain trust). Later on, she's mistakenly dubbed "Wonder Woman" by some little children she saves.
Vandal makes it to the island after, but Batman and Wonder Woman intervene, and are defeated as he finally takes control of the large doomsday weapon. As troops from both sides are defeated, Vandal enters the seen and powers up the missle, already devastating some cities. Finally, after Vandal is managed to be defeated, the weapon is destroyed in outer space by Hal Jordan after malfunctioning.
In the end, the heroes are awarded medals and Lex Luthor is impeached and Vandal is arressted. The Vice President then presents the new team to the world as the Justice League of America (sans Batman).
Justice League 2
Superman
Batman
Wonder Woman
Martian Manhunter
Flash
Green Lantern
Hawkman/Kator Hol: David Kieth
Hawkgirl/Shayera Hol: Morena Baccarin
Aquaman/Arthur Curry: Joel Edgerton
Orion: Michael Keaton
Wally West: Ryan Reynolds
Darkseid: Laurence Fishburne
Lex Luthor
2nd movie: This movie revolves around the League's 2nd year since they've formed. Batman works closely with them, and together they are battling King Arthur Curry who is attacking a harbor. The League capture him and he is brought in for questioning after claiming to be an Atlantean. Later, Kator and Shayera Hol of Thanagarian arrive on Earth after the devastastion of their planet at the hands of Darkseid and his fleet. Darkseid eventually arrives, and the invasion begins. Throughout the movie, Lex Luthor can be shown working with Darkseid in exchange for power (he is then given his infamous purple and green armor by Darkseid). Also, Barry Allen's nephew Wally West will be shown, also trying to crack the Speed Force equation trying to be just like his uncle.
Aquaman joins the team, seeing that his kingdom will also fall under the rule of Darkseid if nothing is done. Hawkman eventually dies, leaving Hawkgirl to join the League in the end. Coast City will end up getting obliterated, causing Hal Jordan to go berserk and get into a fight with the League. Eventually he takes off into space after the defeat of Darkseid and forces himself into exile.
Justice League 3
Superman
Batman
Wonder Woman
Green Lantern II/Kyle Rayner: Jason Lee
Flash II/Wally West: Ryan Reynolds
Martian Manhunter
Aquaman
Hawkgirl
Parrallax: James Caviezel
Lex Luthor and the Injustice Gang
3rd: The film could open up with the League disposing of some villains(s) whom are attack nuclear plant or something. The battle could end with the death of Barry Allen, which would eventually lead up to Wally West trying to join the league, who is refused membership. Throughout the movie he will be trying to prove himself. Meanwhile, Kyle Rayner receives a power ring from a dying GL who has encountered the villain Parrallax, who is one his way towards the Earth. The League discover it is their friend Hal Jordan and decide to increase their forces by adding Kyle to the team to train, and finally Wally, as well as a number of other heroes (it could be a nuch of cameos, but not as bad as X3 handled theirs). Meanwhile, Lex Luthor could also be forming an Injustice Gang together.