Comic Title: House of Secrets #70
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Jan/Feb 1965
On Sale Date: November 12, 1964 Copyright Date November 12, 1964
Source: Library of Congress, Periodicals 1964

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Jack Schiff

Title: "The Demons from the Doorway of Doom"
Pages: 13

Feature(s):
Mark Merlin (of Earth-1)

Writer: Jack Miller
Artist: Mort Meskin

Feature Character(s)

• Mark Merlin (last appearance in House of Secrets #69; next appearance in House of Secrets #71)

Supporting Character(s)

• Elsa Magusson (last appearance in House of Secrets #69; next appearance in House of Secrets #71)
• Memakata (last appearance in House of Secrets #69; next appearance in House of Secrets #74)

Villain(s)

• Harlan Fawkes (head of an occult club; no further appearances)
• Three demons (no further appearances)

Other Character(s)

• Henry Mason (a columnist; no further appearances)
• Several occult club candidates (no further appearances)

Synopsis:
Mark Merlin goes undercover to join the Occult Club of Harlan Fawkes. Mark uses an Egyptian Prism Clock to gain entry into the club, then learns that Fawkes has stolen the artifact. When he confronts Fawkes, he learns that the club leader has uses the clock to open an interdimensional portal. A demon from the other side posseses Mark, but Elsa saves him using the cat charm. Another demon possesses Fawkes. Mark is able to change him back to normal. A third demon attacks Elsa, but disappears when Mark seals the portal.