The Legion of Super-heroes in the 31st Century (2007-2008) #18

“FAILURE TO COMMUNICATE.” Computer chaos hits New Metropolis, crippling the high-tech city and throwing the Legion into the Dark Ages as communications crash, starships collide and magic takes over! Brainiac 5 has to prove that science is stronger than sorcery...but will he have to give up his place in the Legion to do it?