Thriller (1960–1962)
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The Incredible Doktor Markesan 

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.


Robert Florey


August Derleth (story), Donald S. Sanford (adaptation) | 1 more credit »


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Episode cast overview:
Boris Karloff ... Himself / Dr. Konrad Markesan
Dick York ... Fred Bancroft
Carolyn Kearney ... Molly Bancroft
Richard Hale ... Prof. Everett Latimore
Henry Hunter Henry Hunter ... Prof. Angus Holden
Basil Howes ... Prof. Charing
Billy Beck ... Prof. Grant


Fred and Molly Bancroft, a pair of penniless newlyweds, are so desperate that they visit Fred's mysterious uncle Konrad Markesan, whom he hasn't seen in over twenty years. They are hoping to live in with him rent free until they can find jobs and be self-sufficient. The once-beautiful mansion is in a decrepitly musty state, filled with dust, cobwebs, and rats while Fred's once-kindly uncle is now a disheveled, cadaver-like figure who offers them shelter on condition that they never leave their room after dark, a condition that Markesan insures by locking them in at night. Written by (

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Release Date:

26 February 1962 (USA) See more »

Company Credits

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Did You Know?


The twilight of his illustrious career saw Boris Karloff come full circle, as THRILLER was filmed at his longtime home studio Universal; the house seen in this entry is the same one where Lon Chaney's Kharis perished in the fiery finale of 1942's THE MUMMY'S TOMB. See more »


Fred leaves his wife after midnight in order to visit Professor Holden at the university. Against all logic, the Professor is found working diligently in his office. See more »


Boris Karloff: Above all, do not seek me out or disturb me for any reason whatever.
Fred Bancroft: Whatever you say, sir.
Boris Karloff: [Pausing by the door before he leaves] One more condition, and this is vital - I don't care to have you venture forth at night. You must either stay in these rooms from dusk until dawn or leave the house entirely for the night. You understand?
[He exits and closes the door]
See more »

Crazy Credits

Professor Latimore's name is spelled "Latimer" in the end credits. See more »

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User Reviews

When a Guy Says Stay in Your Room, Stay in Your Room
9 December 2016 | by HitchcocSee all my reviews

This August Derleth story from Weird Tales is to die for. Two people, down on their luck, one of them Samantha Steven's husband, ask for help. When it is given, they feel they need to ignore the wishes of the man who is putting them up. This is the sunken eyed Boris Karloff. They can't wait to start messing around in the house. It turns out that our good Doctor Markesan has been thrown out of the university for messing where he shouldn't have been messing. It all falls on the couple who show no respect. As bad as things are in this creepy mansion, if they had listened they would have been on their way! But noooooooooooooh! Of course, we wouldn't have creepy stories if people listened. Boris is great in this. We forget what a fantastic actor he was. It was sad that this series didn't last longer. This may be my favorite episode.

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