Introducing the prototype of his newest product to the entire world, the Ion Cortex, a device capable of solving the world's energy crisis, Bruce Wayne hires brilliant scientist Dr. Jason Burr to work on the project. The announcement also draws the attention of the League of Assassins. When Silver Monkey, one of the League's members, attacks Wayne Manor, it is up to Alfred and Katana to keep the assassin at bay until Batman returns. But Katana is armed and ready for the task with the legendary Soultaker Sword, a sacred weapon she stole from the League of Assassins back when she used to work for them.

After responding to a break-in at the chemical labs at Stagg Industries, Batman rescues a security guard named Rex Mason who had been exposed to a weaponized toxic gas known as "Project Metamorpho." Soon, Rex begins to mutate and gains the ability to manipulate the elements of his own body. Terrified and unable to control his new abilities, Rex becomes a fugitive. Realizing that this metamorphosis is slowly killing Rex, Batman sets out to find a cure. But Rex is only concerned about one thing: Sapphire Stagg (the woman he loves) and he would risk all of Gotham to be with her. But her father Simon Stagg holds secrets of his own and will do anything to keep them apart.