Re: Write-A-Scene for the Superman/Batman movie
I'm a big fan of TSAS episode with Metallo called "The Way of All Flesh". Lex gives a terrorist called John Corben a Kryptonite heart and and sends him to kill Superman, turning him into Metallo. If Metallo is included I think it could make for a very good mechanism that Lex uses to turn the public against Superman. In the episode Metallo looks like a human, Lex would probably make it look like Superman is attacking an innocent human to demonize Supes. Long shot but it could be a cool inclusion.
If both of the movies' villains are Superman's it might also calm the "Batman is stealing Supes' movie!!" brigade.