The beleaguered London of 1898 has bearly had time to assess the injuries of recent conflagrations in its lower class districts when a new threat arrives, falling from the upper atmosphere in gargantuan metal cylinders that leading scientists claim have travelled from the planet Mars! Once again a call goes out through the channels of British Military Intelligence to an improbable group of champions: The League of Extraordinary Gentlemen.
Allan Quatermain, Captain Nemo, Hawley Griffin, Dr. Henry Jekyll, Mr. Edward Hyde and Miss Mina Murray are those champions, and they must rise to the occation of their country's dire need, risking life and limb and disregarding all sense of personal property. But will even their best efforts be enough against a threat so horrific that it nearly defies description?