Comic Title: Super DC Giant S-20
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: Oct/Nov 1970
On Sale Date: August 20, 1970 Copyright Date August 20, 1970
Source: Library of Congress, Periodicals 1970


Newsstand Date August 20, 1970
Source: Newsdealer Magazine, V25 #6

Frequency: Eight times a year
Cover Price: $0.25
Page Count: 64
Editor: Joe Orlando

See Also: The Guide to DC Giants

Title: "Room 13"
Pages: 11

Artist: Jack Sparling

Feature Character(s)

• Cain (last appearance in House of Secrets #85; next appearance in Brave & the Bold #93)

Supporting Character(s)

• Gregory (last appearance in House of Mystery #175; no further appearances)
• Oskar (last appearance in House of Mystery #175; no further appearances)

Villain(s)

• Two burglars (last appearance in House of Mystery #46; no further appearances)
• A gunman (no further appearances)

Other Character(s)

• Marshall, Lisa, and Leroy (children; no further appearances)
• Bart Wade (an actor; last appearance in House of Mystery #51; no further appearances)
• Jim Ferris (a seaman; last appearance in House of Mystery #61; no further appearances)
• A tramp (last appearance in House of Mystery #56; no further appearances)
• A red roc (last appearance in House of Mystery #63; no further appearances)
• Angus and some fishermen (last appearance in House of Mystery #63; no further appearances)

Comments:
Framing sequence

Synopsis:
Three children, Marshall, Leroy, and Lisa, arrive at the House of Mystery. They show Cain an item found outside a curio shop, a box with two tiny men inside. Cain sees a button on the box. When he pushes it, he disappears. The children think Cain has traded places with one of the men in the box, but they are wrong. Instead Cain is transported into one of his stories.

Marshall keeps pushing the button. Each time he does, Cain disappears and reappears in another story. Finally, after many tries, Cain returns to the House of Mystery. He chases the children around the house. Eventually he locks Marshall and Leroy in the mysterious Room 13.