World's Finest Comics 163, Dec 1966 comics.org

Shooter's Credit: writer
Story Title: The Duel of the Super-Duo! - The Super-Combat!
Publisher: DC
Reading Status: required

Script: Jim Shooter
Pencils: Curt Swain
Inks: George Klein
Colors: unknown
Letters: unknown

Synopsis: Jemphis brings Batman and Superman to his World of Wonders for a heroes convention. During a tour, he shows them duplicates of the Batcave and the Fortress of Solitude. Inside each, there is a mesmerizing machine to which Batman falls victim, but Superman escapes. Jemphis turns the sun into a red sun to rob Superman of his powers and Batman attacks Superman. During the battle, Batman and Superman are knocked unconscious. Jemphis puts them in separate prison cells and prepares the arena for a death battle.

Characters: Superman, Batman, Jemphis, Zardin of Nangar, Dr. Chill, Aeroman, Windlass

Places: Gotham City, World of Wonders, Aeroman Headquarters, Solarman Hideaway, Pit of Serpento, Dr. Chill Fortress, Batcave, Fortress of Solitude

Things: Gotham Bridge, Batmobile, Metallic Plants, Sky Vines, Gridzak Plants, Oil-Bladder Bush, Gunner Gourd, Sprayer Lily, Green Kryptonite, Red Sun

Cliffhanger: Hundreds of other hypnotized heroes are in the stands to watch Batman and Superman fight to the death. Superman manages to capture Batman and is given a trident to kill him. Superman can't do it and Batman breaks free. Batman gets the upper hand and goes in to kill Superman.

Conclusion: Batman snaps out of his hypnosis at the last second. Batman in turn cancels out the hypnosis of all the other heroes in the stands. Everyone turns towards Jemphis, who escapes through a hatch and runs into the replica Batcave. Inside, Jemphis trips into the mesmerizing machine and is hypnotized into obeying Jemphis. The hereos find Jemphis kneeling in front of a mirror driven insane. After the heroes hold the convention, they all return home.

Notes: Shooters writing credit obtained from comics.org.