- "Jerome is dead. Long live me."
- —Jeremiah Valeska
Chaos erupts at the GCPD, sending Gordon on a wild goose chase for the culprit behind the mass takeover. Meanwhile, a friend of Bruce's becomes paranoid, resulting in rash and destructive behavior.
- Jeremiah Valeska applying make-up and dyeing his hair in order to hide his transformation is a direct callback to the 1989 live-action movie Batman, where the Joker did the same to give himself a more normal-looking skin tone and hair color resembling his original appearance. Like Jeremiah, he later also revealed his white bleached skin by wiping off the make-up with a cloth.
- Ecco is as a tribute and predecessor to Harley Quinn, since she also wears a jester costume with a red and black diamond design and acts as the Joker's henchwoman.