Dinah Lance meets a strange bus driver calling himself Harry Hack, who apparently has a crush on her. Unfortunately, she later learns that the man is a criminal who stole a bus from Gotham City and has been creating havoc in Star City. The criminal is none other than the Joker and he has apparently become infatuated with Dinah.

The Clown Prince of Crime creates fake news about a disturbance in the city and Oliver Queen changes into Green Arrow, leaving Dinah behind on her flower store. The Joker strikes, and kidnaps Dinah, using his trademark Joker Venom on the only customer in the store who witnessed the event. By the time Green Arrow returns, he finds the Joker's victim and realizes Dinah has vanished.

The Joker takes Dinah away on his Jokermobile and he gives her a choice to marry him or be killed. Fortunately, the Joker is distracted as his main plan has been set in motion and soon, the criminal and his henchman take Dinah to the Archway Bridge, where they replace a golden star with their own tampered version in order to create a traffic disturbance in the bridge, which would allow the Joker to steal valuable objects from a nearby museum without police interruptions.

Green Arrow arrives at the bridge in time to save Dinah and stop the Joker's evil scheme. However, during the confrontation, the Joker falls into the river below. Green Arrow doesn't try to save the madman and the police soon take control of the situation, although the Joker is nowhere to be found.