Superman / Batman [Free Comic Book Day Edition] #1-Mint (9.9+)

Metallo is committing crimes in both Metropolis and Gotham, meanwhile a kryptonite asteroid is on a collision course with Earth.

A new, improved Metallo attacks both Metropolis and Gotham, bringing the guardians of each city together for a monumental battle! Plus, Lex Luthor assembles a mysterious super-team assigned to "help" the Man of Steel.