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On the Ninja Turtles side is

Leonardo
Michaelangelo
Donetello
Rapheal
Splinter
Casey Jones
April O'Neil

On the Bat Family side is

Batman
Nightwing
Robin
Bat Girl
Huntress
Catwoman
Oracle

The meet for battle in the streets of a neutral city.

neutral city like chicargo or newcastle.

Bat Family. Cassandra Cain would probably beat the Turtles herself.

I don't know about that Leo and Raph could get young miss Cain..but I do believe Batman and his "family " would win.

well they'd be winning untill the villain came along then the 2 teams would team up and beat the villain if this was a comic

Indeed..the Joker and the Shredder would join forces to destroy The acrused Turtles and the Bat man Squad.

nah penguin and lord dreg.

Cassandra Cain is much more skilled then Leo and Ralph together. She knows what they are going to do before they do it themselves.

how can she do that?

She can read body langauage...I doubt she could beat all four of them.

What if She can't read the Turtles body language...I mean she might not you know.

plus the fact that they have shells

yeah if Batgirl tried to read the turtles body language she could get Shell shock and the fact their cold blooded my affect her ability to predict thier moves as well.

and because of there shells they would move differently to humans

Indeed Muffin Man go thinking Bro.

see the 2 of us unitted defender those teenage mutant ninja turtles

Indeed we have Muffin Man .

I still think that batman and his sidekicks will win but I think it'll will involve Batman cause I think raph and leo would beat her due to there ability to use erractic movement and there shell but I think robin would be taken out by mikey and casey but batman would beat donny and splinter.

I could see the fight happening just like that.

yes

the way i see it is it comes down to batman vs all the turtles while splinter is taking a rest.. then the bat finishes them all off as splinter starts to rise... then we see the ultimate showdown.

Batgirl uses the "Falling Leaf" technique and knocks them all out in one fell swoop.

The Bats would be having turtle soup for the night. The only real fight here would be between Batgirl and Batman on who would be the one to take down Splinter. Batgirl would kick Batman's a$$, and thus gain the pleasure and opportunity to add slayed rat to the turtle soup vat!
Nightwing, on the other hand, would probably be making moves on April O'Neil. You know - moves .....

Is it pre-crisis Casey Jones?

Old comic Turtles were badass and brutal; they take it.

Question. Was Casey Jones (old cartoon) as much a lunitic as he was in the comics?

Don't offend me with turtles soup