I would strongly recommend reading the comic book, it's collected in trade paperback form and should be relatively easy to find. Unfortunately, the writer of the book, Alan Moore, had no real influence in the film's direction, and as a result much of the richness of the characters and their world were, in my opinion, lost. Much of the dynamics between the characters that existed in the book, and which stayed extremely close to their sources, it would seem, were disregarded in the making of the film. Quartermain, for instance, is an opium junkie who is forced to come to grips with his addiction. Hardly the kind of person who could possibly take responsibility for leading a team. In the comic, Mina is a much more strong and independent character, is not a full vampire, and leads the team with great skill. The filmmakers seem to have relegated her to a rather ineffectual role where her character has very little room to develop. The inclusion of Tom Sawyer in the film, well, let's just leave that one alone (the common thread between the characters in the comic was their existence as Victorian, read: English, literary heroes). Then again, Hollywood action films have rarely displayed themselves as intelligent movies with great characters. It's a shame, this film had a lot of potential, but failed to recognize what made the original material so good. I'm dreading next year when the Catwoman film reaches theatres.