Justice League United Vol. 2

THE JUSTICE LEAGUE UNITED VS. THE LEGION OF SUPER-HEROES!
Martian Manhunter, Green Arrow, Supergirl, Animal Man, Stargirl, Equinox, and Alanna and Alan Strange—together they are the newly formed super-team, the Justice League United.
During the mission that brought them together, the JLU saved a young alien named Ultra. Created by a mad scientist named Byth, Ultra is a combination of many different alien genes, and thus, a being of incalculable power.
While he’s currently just a small boy, Ultra is possibly the most dangerous creature alive. And now, the Legion of Super-Heroes—a team of super-powered champions from the 31st century—have traveled back to our time to ensure that Ultra never reaches his catastrophic potential—even if it means killing him!
It's a tale of time travel, teamwork and travesty as writer Jeff Lemire (GREEN ARROW, ANIMAL MAN) and artist Neil Edwards (FOREVER EVIL: A.R.G.U.S.) bring together two teams of heroes from across centuries in JUSTICE LEAGUE UNITED VOLUME 2: THE INFINITUS SAGA.
Collects JUSTICE LEAGUE UNITED #7-10, JUSTICE LEAGUE UNITED ANNUAL #1, JUSTICE LEAGUE UNITED: FUTURES END #1 and JUSTICE LEAGUE: FUTURES END #1.