This article is all spoilers.
What's the plot of Batman v Superman: Dawn of Justice*? What will baddie Lex Luthor be doing and how will he be any sort of menace to Superman at all? What makes Batman and Superman team up with Wonder Woman? Geek Tyrant has stumbled upon the answer. They spoke to an extra who worked for ten days on set, and that extra told them:
According to the extra, the ending of the film has already been filmed. One of the scenes shot featured Batman breaking into Lexcorp to steal kryptonite, and apparently Lexcorp had somehow gotten ahold of General Zod's body.
I can confirm this. Lex has been gathering pieces and debris from the World Engine and he has used them to synthesize Kryptonite. Meanwhile he has also gotten ahold of Zod's corpse, and it is the key to his master plan to defeat Superman. He uses that tissue to... well, that would be spoiling. But Superman hasn't been defeated many times in the past. You can probably connect the dots from here.
* I assure you, this is the actual title of the movie.