When evil scientist Mr. Freeze activates his latest invention on two of Gotham City’s most formidable criminals Killer Croc and Chemo, things go from bad to worse. Turning them into super-sized mutant monsters, the supervillains start bashing through the streets of Gotham City with no end in sight. It’s up to the Caped Crusader and his superhero team to save the day by utilizing their new giant robot mechs, but it will be an uphill battle as they face off against enormous foes. Meanwhile, Freeze’s partner in crime and sidekick Penguin has plans of his own for Freeze’s invention and two of his test subjects Bane and Clayface.