League of Extraordinary Gentleman Vol. II by Alan Moore and Kevin O'Neil
Collection of 6 comic books in the 2nd volume of the series. Set in an alternate, technologically advanced 1898 London, the story finds legendary literary heroes Allan Quartermain, Captain Nemo, Hawley Griffin (the Invisible Man), Edward Hyde and Mina Murray fighting battles that the British Empire can't handle without them. Here, the eclectic team is defending Earth from a Martian invasion, partially set in motion by another pulp hero, Edgar Rice Burroughs's John Carter of Mars. I have not read Volume I yet so will go back and see if it fills in any blanks.