You're invited to a spectacular anniversary celebration as Paul Levitz unites the World's Finest with the super-team he's best known for - the Legion of Super-Heroes! Lex Luthor has finally unleashed a threat powerful enough to gain the Legion's attention in the far future, but to take Luthor down, they'll have to journey into the past and ask for help from both Batman and Superboy! Plus, Joe Kelly and various writers and artists chronicle the history of The Man of Steel and The Dark Knight in adventures that span from yesterday into the far beyond! Adam Hughes writes and draws a tale starring Supergirl and Batgirl, J.T. Krul and Francis Manipul deliver a tale of Superboy and Red Robin seeking advice from their mentors, Ace and Krypto get leashed by Duncan Rouleau, David Finch writes and illustrates a story for the first time, and Joe Kelly, Steven T. Seagle, Billy Tucci and many more surprises help commemorate this anniversary extravaganza!