Penniless Fred Bancroft, along with his new wife Molly, visits a sinister uncle he hasn't seen in years in hopes of living rent-free in his musty, decaying mansion.
Unfortunately the movie The Incredible Doktor Markesan is not yet available on HBO Max.
| Production | Douglas Benton | Associate Producer |
| Art | Julia Heron | Set Decoration |
| Sound | Pete Rugolo | Music |
| Art | John McCarthy Jr. | Set Decoration |
| Costume & Make-Up | Florence Bush | Hair Designer |
| Costume & Make-Up | Vincent Dee | Costume Supervisor |
| Art | Howard E. Johnson | Art Direction |
| Editing | Danford B. Greene | Editor |
| Writing | August Derleth | Story |
| Art | Jerome Gould | Graphic Designer |
| Sound | Morton Stevens | Music |
| Directing | John Clarke Bowman | Assistant Director |
| Directing | Robert Florey | Director |
| Writing | Mark Schorer | Story |
| Costume & Make-Up | Jack Barron | Makeup Artist |
| Sound | Stanley Wilson | Music Supervisor |
| Production | William Frye | Producer |
| Sound | Corson Jowett | Sound |
| Writing | Donald S. Sanford | Adaptation |
| Editing | David J. O'Connell | Editorial Manager |
| Camera | Benjamin H. Kline | Director of Photography |
