Batman finds out he’s been poisoned with something called the Colossus virus, a toxin that’ll kill him in two weeks. Following a trail of evidence leading him to Germany, he finds Joker there, interrogating the person who sent him the message. Joker reveals that he’s also been poisoned with the Colossus virus, and has a few pieces of the puzzle that’ll solve this mystery. Realizing that they need each other in order to uncover the truth, Batman forms a temporary partnership with The Joker in order to get the cure and save their lives. Their adventure takes them all across Europe, including Prague, Paris, and Rome, fighting all manner of bizarre enemies along the way.
