before the 2nd series finished (how many months/years between issues??) people on here were speculating on what the secret weapon would be?? the best suggestion was that it would be a giant rat (its origins come from being mentioned in passing in some Sherlock Holmes story and the legends of Giant Mice in Europe; possibly the Giant Mouse of Minsk from American Tail??)...rats carry disease and disease is what defeated the aliens from War of the Worlds...the actual ending was very anti-climactic as it was just a bio-engineered virus...

there's a 3rd book on the way from Fantagraphics I think...its no longer at ABC/DC Comics...