After the defeat of Jack Luthor and Deathface, the Kryptonian clone of the Erradicator, Batman and Superman soon catch wind of Dexter Dent, also known as the Joker, having broken out of Arkham Asylum, and is now wreaking havoc upon Gotham alongside Harley Quinn, the Firefly, Bloodsport, and two sword-wielding sorcerers named Henri and Constance Ducard, whom Bruce Wayne eventually learns are Ra's al Ghul and his daughter Talia, the mother of Damian Wayne. Now, both Robin and Superboy must fight alongside their fathers in yet another battle which will determine their true capabilities of being heroes.
