Cain, cadaverous caretaker, here...I've decided to take the weekend off, so I've locked up the House of Mystery. and I'm off to the slime pits for a little swimmin' and fishin'. C'mon along. On the way, I'll tell ya about an incident that occurred right around my favorite pond. It's the kind of thing one keeps...All In The Family... 
- — Cain
House of Mystery #204 is an issue of the series House of Mystery (Volume 1) with a cover date of July, 1972.
Synopsis for "All in the Family"
A couple stuck in the swamp stop at a house for help. The woman recognizes the place from a dream she had where two disfigured old people opened the door and fed her to a blob-like creature. The person who opens the door is a beautiful woman who invites them to stay for dinner. The man relates the dream to the host and she admits the pair in the dream sound like her parents and she mentions that she has a brother. The woman screams when the blob-like brother enters the room and devours her. The man returns to the car and disposes of it in the bog and hurries back to the beautiful lady hoping to score with her. The ugly old parents open the door and invite him to relax on the couch as their daughter changes into "something more comfortable" as tentacles begin waving from up behind the couch.
Appearing in "All in the Family"
Narrator:
Featured Characters:
- Fred (Single appearance)
- Mary (Single appearance; dies)
Supporting Characters: Antagonists:
- Gloria (Single appearance)
- Ookey (Single appearance)
- Gloria & Ookey's parents (Single appearance)
Locations:
- House of Mystery
- The Everett House
Vehicles:
- Fred's car (Destroyed)
Synopsis for "Never Deal With a Demon"
A man summons a demon and demands money. The demon tells him that they must strike a bargain as he can't just give something for nothing. The demon tells the man that he will take something small from him that he will never miss, and as long as he never passes through a red door, he will be safe from the demon's vengeance. The man agrees, and the demon vanishes leaving behind a pile of money. The man takes the money to the bank and the demon is waiting for him inside. The man protests, but the demon tells him that he took his color vision, and that the bank door that appeared grey to him was actually red.
Appearing in "Never Deal With a Demon"
Narrator:
Featured Characters:
- Cooper (Single appearance)
Antagonists:
Synopsis for "To Die For Magda!"
Stefan Tiza meets a mysterious woman named Magda Kossu at a costume party. The couple quickly becomes engaged, but Magda asks Stefan to ask her father for her hand in marriage. Stefan meets with Magdas father, but he puts a stipulation on the marriage. He informs Stefan that Magda has been accused of being a witch and head of a coven. The accusation came after Magda refused to marry the head of the secret police. The father suspects that the police might manufacture falsified evidence against Magma. The father proposes that Stefan confess to being the head of the witch coven to throw suspicion away from Magda. Once they are married, the father speculates that the charges will be dropped, and the confession would be destroyed. Stefan agrees to the deal, but it is then revealed that Magda is actually in love with Janos who is posing as her brother. It is Janos who is the real head of the witch coven, and it was his idea to frame Stefan. Stefan and Magda are soon married. Janos attempts to kill off Stefan in various ways, but his attempts fail. Stefan eventually shoots Janos in an act of self-defense, and he reveals that his real name is Stefan Karolsi head of the secret police. The police had suspected Janos of being a witch and Stefan has been working undercover to expose him. Magda reveals herself to be a real witch and turns Stefan into a hideous monster.
Appearing in "To Die For Magda!"
Narrator:
Featured Characters:
- Stefan Karolsi (Single appearance)
Antagonists:
- Magda Kossu (Single appearance)
- Count Janos (Single appearance; dies)
- Mr. Kossu (Single appearance)
Locations:
Notes
- Mary Skrenes is credited in this issue as "Virgil North".
- This issue is reprinted in Showcase Presents: The House of Mystery Vol. 2.
- "All in the Family" is also reprinted in DC Special Blue Ribbon Digest #24.
- "Cain's Game Room" was drawn by Sergio Aragonés.
- "Realm of the Mystics" retells a Muslim legend about Zacornu, the tree of demons. It was drawn by Jack Sparling and lettered by John Costanza.
See Also