Never saw that one, M E M. But a nice lineup of DC mystery characters.

I love the Demon, either in the Kirby series (collected about 4 years ago in a THE DEMON hardcover), and in his Aparo-illustrated BRAVE & THE BOLD appearances.
Likewise SWAMP THING, by Wein Wrightson, Redondo, or in Aparo's B & B.
Man-Bat had a nice series of late-70's stories in BATMAN FAMILY, by both Marshall Rogers and Michael Golden, as well as some great B & B appearances too.
Bizzaro I don't recall in any great 70's stories.
And the last one is Solomon Grundy? I've loved that character in just about every appearance. A compelling character in the Frankenstein mode.