Jimmy Olsen was a hacktivist who went by the web-name "Accountable". The scale and effectiveness of his activities led the public to assume he was an entire organization.
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Personas
History
FIRST APPEARANCE: Earth 2 #18 (February, 2014)
He was eventually captured by the World Army and imprisoned at their Arkham Base. Jimmy would be freed by the new Batman, Red Tornado, and Sonia Sato along with fellow prisoner Aquawoman. Before leaving Jimmy would have them free another previously unknown prisoner that had been one of the reasons for his imprisonment. This "alien" as he called it would turn out to be a Kryptonian named Val-Zod who was held there by Terry Sloan. After heading to the exit Batman would have Red Tornado blindfold Jimmy so he would not see the battle outside which had turned into a slaughter. Jimmy would be successfully extracted by Red Tornado and taken to the Batcave with Val.
Jimmy was brought to the Batcave with Red Tornado and Val, where he met up with the rest of Batman's allies.