It's chaos when two of Batman's archenemies get together in BATMAN UNLIMITED: MECHS VS MUTANTS. The Penguin and Dr. Freeze, with differing motivations, want to immobilize Gotham City, and the weapon they're using is a Giant Freeze! As the city begins to frost over, Batman and Robin get ready to take on this instant threat. Little do they know, however, that the villains have more terrible threats planned. Not only do they break Bane, Chemo, and Clayface out of Arkham Asylum, but they have the means to use the deviants' unusual composition to transform them into giant mutants. Combining Bane's venom, which enlarges and makes him strong; Chemo's toxic sludge and acid mutations; and Clayface's mud-stretching ability to turn into anything, Penguin and Dr. Freeze have the most horrific weapons at their service. And Killer Croc is along for the ride, as well. Gotham City is under siege, in danger of being turned into the Arctic! But Batman, Robin, Green Arrow, NightWing, and Flash are up to the challenge that has been set before them. Armed with their super resources, determination, bravery, and the ability to "mutate" themselves, Green Arrow and Batman become giant Mech robots, battling the mutants to save their city. Together with the rest of their heroic brothers, it's an explosive fight to the finish.