Originally Posted by FeedOnATreeFrog
I think it would be cool if both Lex and the Joker (off-screen) were secretly responsible for the events of the movie behind the scenes (revealed at the end of the movie).
Perhaps Lex secretly programs Metallo/Bizarro/Cyborg-Superman to attack Metropolis but be able to shut down on command (so he can "save the day" in his battle suit).
However, the programming malfunctions allowing it to regain its free will (and not being able to shut down on Lex's command), and Lex wusses out; thus Superman is required to save the day.
Have it hinted at the end why the programming malfunctioned when Lex finds a Joker card on his computer (suggesting that the Joker sabotaged things, simply to cause chaos, showing the difference between Joker and Lex).
And seeing that they're sticking with the title of Batman vs Superman, how would that play into things?