The best-selling Harley Quinn continues her bloody romp in the second volume of her own series! The first rule of Skate Club is...you do not mess with the Mistress of Mayhem! Harley stumbles across an underground fight club where big money winds with a body count. She's in...and she's making Sy Borgman her agent for the fights. And wha would happen if the demented Clown Princess of Crime visited the most popular comic con out there? Find out when Harley Quinn invades Comic-Con!! Collects: Harley Quinn #9-13, Harley Quinn Futures End #1, Harley Quinn Invades Comic-Con International: San Diego #1 and a story from Secret Origins #4.