Justice League Vol. 5 Forever Heroes (The New 52)
As the Crime Syndicate hunts down the few heroes left foolish enough to
challenge them - including Batman's protege, Dick Grayson - Owlman
has other plans for Nightwing, and Owlman's teammate: the most deadly being on
the planet: Ultraman! Also, Cyborg is one of the lone Justice League members
left to fight against the villains that have taken over. How can he possibly
find a way to defeat them? Who can he turn to? Two words: Metal Men!
Collects Justice League #24-29.