Sure, the Gang has finally figured out who Harley Sinn is and, more importantly, where she’s holding Harley hostage—but considering it’s a place called The Island of Horrible Death, they might be thinking twice about going there...

Atlantic City, Hanuquinn kills Rockin' Randy but gets hurt badly.

Somewhere else, Harley Quinn wakes up in a holo-deck on Sinn's private island.

Coach and Big Tony go to see Richard Brand, Harley Sinn's father. They convince him to tell them where Sinn is keeping Harley Quinn. The gang then gets Captain Strong to take them to Sinn's island, The Island of Horrible Death, to save their leader.

The Gang get to shore, leaving Coach, Captain Strong, Eggy and Goat Boy on the boat. Once on the island they have to deal with Harley Fish (just like joker fish but with Harley Quinn faces), Eggy bombs, Mutant seaweed, and robots of Poison Ivy, Catwoman and Power Girl.

Meanwhile inside the compound, Harley Quinn escapes her cell, and prepares to cause some damage.