A massive planet suddenly materializes near Jupiter and threatens to tear our solar system apart. The only ones who can help are the rebellious super-teens of the Legion of Super-Heroes...but before they can save the Earth, they'll first have to survive the powerful internal forces threatening to tear the team apart. Acts of love and betrayal distract their most powerful members. Mysterious raids by deadly aliens threaten their lives. And a shadowy conspiracy being organized by one of their own members threatens to take down their organization. There's never been a more dangerous time to be a Legionnaire... and there's never been a time that the universe has needed them more. But, will their finest hour prove to be their final hour?