Wayne Manor is perhaps the most secure place in all of Gotham City. If the Joker intends to make good on his threat, he’s in for a smashing surprise. A surprise which, if Alfred dares to be so bold, he’s very much looking forward to…

Slowly, patiently, the Radioactivator powers up. A muffled, monotonous hum vibrates through the laboratory as it comes to life. Like some weird mechanical heartbeat, a deep purple light pulses out of the Radioactivator’s chamber. The detectives gaze down into the little window, their faces dyed a royal hue.

Proving Batman’s point, a group of colorful balloons begins to emerge over the tree line and drifts toward the clearing where our heroes stand. A few of the balloons have popped, but the poor soul attached to them is still flying entirely at the mercy of Mother Nature…