Mystery Comics Digest was published for 26 issues, from 1972 to 1975. All reprinted stories from three of Gold Key's mystery/suspense/fantasy/science fiction anthologies: Ripley's Believe It or Not!, Boris Karloff's Tales of Mystery, and Twilight Zone, in a three-issue rotation. Each issue highlighted the title it was reprinted from on the cover. Issue focus: * Believe It or Not!- #1, 4, 7, 10, 13, 16, 19, 22, 25 * Boris Karloff- #2, 5, 8, 11, 14, 17, 20, 23, 26 * Twilight Zone- #3, 6, 9, 12, 15, 18, 21, 24 Tragg appeared in issues #3 and 9 before getting his own title.