Superman 191, Nov 1966 comics.org

Shooter's Credit: writer
Story Title: The Prisoner of Demon! - Demo the Diabolical!
Publisher: DC
Reading Status: required

Script: Jim Shooter
Pencils: Al Plastino
Inks: Al Plastino
Colors: unknown
Letters: unknown

Synopsis: The Maharajah of Sinsubhani requests Superman's help in keeping the Star of Sinsubhani out of the hands of DEMON. Superman is unable to destroy the jewel and seeks to find Maharajah of Sinsubhani's hiding son, Prince Krishna, who is the only one who knows how to destroy the jewel.

Characters: Superman, Maharajah of Sinsubhani, DEMON, Prince Krishna, Lois Lane, Jimmy Olsen, Perry White, Dr. Demo

Places: Metropolis, Daily Planet, Sinsubhani

Things: Sacred Star of Sinsubhani, Green Kryptonite

Origin of: DEMON, Sacred Star of Sinsubhani
Death of: Maharajah of Sinsubhani, Dr. Demo, Sacred Star of Sinsubhani

Cliffhanger: Dr. Demo, leader of DEMON, has Superman trapped. Lois Lane and Jimmy Olsen are held hostage and will die unless Superman gives up the Star of Sinsubhani.

Conclusion: With no other choice, Superman reluctantly gives up the jewel to save his friends. Once Dr. Demo has the jewel, he destroys it. Dr. Demo was actually Prince Krishna in disguise.

Notes: Shooters writing credit obtained from comics.org.