Just create what intro dialogues you wish were in the game. I will keep editing this as time goes by.
Supergirl : Forget your past Kal-El
Superman : I can't I killed Billy he was just a kid.
Supergirl : You weren't yourself get over it.
Atrocitus : If you don't join us your planet will die.
Green Lantern : I am not joining the Red Lanterns ever.
Atrocitus : Then your puny planet shall die.
Batman : You are under Brainiacs mind control device.
Aqua Man : Lies I will shut you up for Atlantis.
Batman : You will not be the one who kills me.
Bane : Gorilla Grodd needs us Ivy
Poison Ivy : Then we shall deliver our duty to him.
Bane : Yes by destroying Batman and his allies.
Doctor Fate : I have changed many pasts and futures yours was a mistake.
Robin : What the hell do you mean ?
Doctor Fate : I mean it wasn't you who killed Dick it was Scarecrow.
Cheetah : You think you can save this world Diana.
Wonder Woman : Yes from creatures like you.
Cheetah : I promised to kill you now it is time.
Cyborg : Being bad sucked.
Blue Beetle : Well being upgraded doesn't suck.
Cyborg : Let's train you silly kid.
Deadshot : Let's be serious I am cool.
Harley Quinn : Bats is cooler than you.
Deadshot : It's a shame that I have to silence you.
The Flash : You and your Society is no match for us.
Gorilla Grodd : We will prove our strength is greater than yours.
The Flash : Don't confuse me with Superman Grodd.
Captain Cold : Ice and Machine this can work.
Brainiac : What are you rambling about human ?
Captain Cold : That we make a good team.
Black Adam : So you like the color black.
Black Canary : Well not just black but I am also a Black Lantern.
Black Adam : Interesting give me that ring.
Darkseid : My old lackey greets me.
Scarecrow : I am no lackey of yours I am much more.
Darkseid : Prove that you are useful and you will live.
Catwoman : How are you alive Joker ?
Joker : I fooled you and superman with my Joker bot.
Catwoman : Well this cat will not let you have a second life.
Firestorm : I will warm you up.
Mr. Freeze : I will cool you down.
Firestorm : Victor you will change the world.
Swamp Thing : I found you and revived you.
Green Arrow : Thanks buddy.
Swamp Thing : Now we can bring justice to our enemies.