The beleaguered London of 1898 has barely 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 to have travelled from the planet Mars! Once again the call goes out through the channels of British Military Intelligence to an improbable group of champions: The League of Extraordinary Gentlemen.

Allain Quartermain, Captain Nemo, Hawley Griffin, Dr. Henry Jekyll, Mr. Edward Hyde, and Miss Mina Murray are those champions, and they must rise to the occasion of their country's dire need, risking life and limb and disregarding all sense of personal propriety. But will even their best efforts be enough against a threat so horrific that it nearly defies description?