"Damian Wayne and Jon Kent, the sons of Batman and Superman, take to the past to reveal a secret adventure in which Superboy and Robin find themselves targets of an interstellar team of young badasses called the Gang! Locked in an intergalactic juvenile detention facility, Superboy and Robin meet the youngest--and meanest--Green Lantern ever! Well, sort of a GL. Mostly a GL. Really more of a trainee, but don't tell the bad guys, okay? Plus, Joker Jr. returns ... the clown who may be the boys' last, best hope to stop the Gang!"-- Provided by publisher.