 It was eventually revealed that the programming glitch the Manhunters suffered was caused by Krona to prove to the other Guardians of the Universe that there are flaws in an emotionless police force.While running from the Alpha Lanterns, John Stewart and Guy Gardner find dozens of deactivated Manhunters in the Guardian's Ring Foundry.They re-energize the robots using the Foundry essence in order to fend off the Alphas.