For some "Thriller" offciandos, "The Incredible Doktor Markesan" marks the last classic of the "Thriller" canon. This story features the last acting performance of Boris Karloff in the title role on the "Thriller" anthology. A young Dick York portrays the poor nephew of Doktor Markesan, whose fortune goes from bad to worst.
"The Incredible Doktor Markesan" is based on a story by H.P. Lovecraft prodigy August Derleth and is directed by Robert Florey, Bela Lugosi's director for "Murders in the Rue Morgue."