When a top-secret unmanned spacecraft disintegrates on re-entry, its mysterious military payload crash-lands in the crocodile habitat of a place called Adventure Land, a combination water park, amusement land, and world-famous crocodile exhibit. Following its pre-programmed instructions, the payload—a next-generation nanotech-based combat drone—finds a host in the form of the park’s prize twenty-foot Australian Saltwater crocodile, Stella. She is the largest saltwater croc in captivity. Immediately upon infecting its host, the drone payload’s nanobots begin to transform Stella from an organic living creature into a lethal killing machine with only a single directive: survival!

Mr. Freeze turns Killer Croc and Bane into super-sized monsters, and they bash their way through downtown Gotham until the Caped Crusader and his team of heroes join the fight in their giant robot mechs.