Board Thread:Comics/@comment-31667040-20170404113118/@comment-3361105-20170404165443

As far as I can surmise, no proper Swamp Thing volume had any backup stories/anthology issues except annuals, and the multi-story annuals tend to star swamp thing.

The only thing that seems remotely similar to that (of which I am aware) is a story that was in the very first Swamp Thing appearance, in House of Secrets Vol 1 92 about a guy who is obsessed with what happens after death.