Comic Title: Superman #191
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1966
On Sale Date: September 15, 1966 Newsstand Date September 15, 1966
Source: Direct Currents, Tomahawk #107, Page 11

Copyright Date September 15, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Monthly, with the exception of Mar., Sept. and Dec.; (semi-monthly, Jan.)
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The Prisoner of Demon"
Pages: 24

Feature(s):
Superman (of Earth-1)

Writer: James Shooter
Artist: Al Plastino

Feature Character(s)

• Superman (last appearance in World's Finest Comics #162; next appearance in Superman's Girl Friend, Lois Lane #70)

Supporting Character(s)

• Lois Lane (last appearance in Action Comics #342; next appearance in Superman's Girl Friend, Lois Lane #70)
• Jimmy Olsen (last appearance in Superman's Pal, Jimmy Olsen #97; next appearance in Superman's Girl Friend, Lois Lane #70)
• Perry White (last appearance in Superman's Pal, Jimmy Olsen #97; next appearance in Superman's Girl Friend, Lois Lane #70)

Villain(s)

• Demo and agents of Demon (no further appearances)

Other Character(s)

• The Maharajah of Sinsubhani (dies in this story; no further appearances)
• Prince Krishna (no further appearances)

Comments:
Part 2: "Demo the Diabolical"

Synopsis:
The Maharajah of Sinsubhani brings Superman a rare alien jewel which is capable of great destructive force. Superman is unable to destroy the jewel, and the evil organization known as Demon seeks to possess it. Superman protects the jewel from Demon despite several attacks from their forces. When Demon holds Lois and Jimmy hostage, he allows himself to be captured.

Superman is brought before the leader of Demon and forced to turn over the jewel. Fortunately the leader is an imposter. It is really Prince Krishna, the son of the Maharajah. Krishna has discovered the way to destroy the jewel and does so. He had infiltrated Demon solely for that purpose. With the jewel destroyed, Lois and Jimmy are released.