Black and white reprint of the famous "Saga of the Swamp Thing" #21, one of the most important issues in modern comic book history.
The original plan had been to reprint in color, in the same fashion as Essential Vertigo: Sandman. But black and white reprints already existed for a previous publication, thus making it cheaper to produce.
— Description from Comic Vine community (comicvine.gamespot.com).
