How nuts would it be if Batman starts up the Batsignal, him and Supes throwdown throughout Gotham, ending with Superman tearing off the hood of the Batmobile (as we've seen in the trailers), and then other members of the Batfamily start dropping down onto rooftops around Superman, revealing that this was the real reason Bat sent the signal out. Cue Nightwing, Red Robin, Catwoman, Cassandra's Batgirl, Spoiler, all teaming up with Bats to take on Supes?
I know it's impossible. I know they wouldn't stand a chance. I know it'd be out of character for most of 'em to do that.
But imagine seeing it, all of them onscreen surrounding Superman.
You just wrote my dream movie!!!
But i dont think sidekick exist. Maybe nightwing at best.