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Alan Moore's tenure on the Swamp Thing title is considered to be truly groundbreaking. There's massive opportunity for over-the-top farce in Swamp Thing, but Moore takes the character seriously and spins complex tales of love, humanity, evil, and ambiguity. The series is also the birthplace of Hellblazer's John Constantine, and the contrast between Constantine's smart-mouthed, "victory by any means necessary" attitude and Swamp Thing's slow-talking, moral, and fiercely loyal personality is fantastic. This series isn't for the squeamish; we're talking radioactive zombies, dismemberment, creepy-crawlies, etc., but if you like your horror to be smart, well-written, and funny, you need to check this out.