justice league:battle against the universe

it been a few years since cybrog had joined the justice league with saving the world but the entire universe the league had been grown bigger then ever one day a hero going by the name of "astroman" who saved them later down the road the league are concerned and worried about the new member since there little to no history about this individual is he a mole of the league or there more to this new hero find out in battle against the universe (i don't own DC minus the OCs like Astroman for ex.)