Story: "River Run Ch. 4: The Secret of Slaughter Swamp" (24 Pages)

Credits:

Mark Miller (plot, script)
Phillip Hester (pencils)
Kim DeMulder (inks)
Richard Starkins/-Comicraft (letters)
Tatjana Wood (colors)
Stuart Moore (edits)

Feature Character:

Swamp Thing

Supporting Character:

Anna (as the wife of Laurence Cooper/Black Box; see Comment)

Guest Star:

Black Box (Lawrence Cooper; first appearance; a superhero; see Comment)

Villain:

Solomon Grundy (first appearance; a counterpart of the DC Universe character in an alternate universe; see Comment)

Other Characters:

Michael Cooper (the son of Anna and Laurence; deceased)
Mr. Malloy
Harry Shaw
Harold
Maude
Cyrus Gold
Slim Jim Cooper
Drew Fitzpatrick
Jean Hansen (first appearance of all; latter four die; see Comment)

Comment: All characters except Swamp Thing appear as characters from an alternate universe described in Anna's book "River Run". Swamp Thing possesses the body of Solomon Grundy in this story.