And now for the second issue.
Saga of the Swamp Thing #21 "The Anatomy Lesson"
The second issue is the highlight of the run. It works pretty well as a standalone comic, and as the beginning of a new arc. It starts as a D-list villain is brought in to advise people who think they have killed the Swamp Thing, and just want to figure out how to make money from him. There's a very matter of fact way to how the villains operate. One guy is rich and connected; he doesn't think he needs to understand everything immediately in order to make a fortune. The other guy wants to stay out of jail, but he's able to make a crucial connection. The regular supporting characters disappear for this issue, which makes it more effective as one-off (although obviously it's excellent as part of a larger run.)
This reads like a horror story, and it's a damn good one. I don't know the extent to which this is typical of the early run by Paska and company, or the original run by Wein and Wrightson. I should definitely check out the latter. Steve Bissett and John Totlebon's art has the right mood for a story about an unsettling discovery at night.
This is not the last time Moore has an autopsy in a major comic book scene, but it is quite effective as an excuse for exposition. And it leads to the big discovery, one of the most significant retcons to any DC character, something that changes not just the Swamp Thing, but sets in motion new story engines for other series as well. But if all you want to read is this one issue, you're still going to have a good time.
Grade: A+