Comic Title: House of Mystery #155
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: December 1965
On Sale Date: October 7, 1965 Copyright Date October 7, 1965
Source: Library of Congress, Periodicals 1965

Frequency: Monthly, with the exception of February, May, August and November
Cover Price: $0.12
Page Count: 32
Editor: Jack Schiff

Title: "The Giant Genie of Gensu"
Pages: 9

Feature(s):
Martian Manhunter (of Earth-1)

Writer: Jack Miller
Artist: Joe Certa

Reprinted In:
Showcase Presents:Martian Manhunter Vol. 2 TPB (2009)

Feature Character(s)

• Martian Manhunter (last appearance in Justice League of America #40; next appearance in Justice League of America #41)

Villain(s)

• The Idol-Head of Diabolu (last appearance in House of Mystery #152; next appearance in House of Mystery #156)
• The Genie of Gensu, Mousy Mulloy, Duke Durgon, and his gang (no further appearances)

Synopsis:
From the Idol-Head of Diabolu springs another menace, the Genie of Gensu. The first man the genie meets is small-time crook Mousy Mulloy. The genie offers himself to Mulloy, who uses the genie to take over the local gang commanded by Duke Durgon.

Mulloy then orders the genie to steal a bank vault. J'onn J'onzz attempts to stop the genie, but he is not powerful enough. Instead he follows the genie back to the gang hide-out and impersonates Duke. J'onn then tricks Mulloy into sending the genie away.

While the genie is on a wild goose chase, J'onn impersonates the genie and reclaims the bank vault. He then attacks the gang. Just as the real genie is returning, Mulloy orders the genie to disappear. The real genie obeys the order, and J'onn is free to round up the gang.