I hope that-- the whole rest of my life, I never again have to go chase myself! 
- — Batman
World's Finest #155 is an issue of the series World's Finest (Volume 1) with a cover date of February, 1966.
Synopsis for Superman and Batman: "The 1,000th Exploit of Superman and Batman!"
As Superman, Batman and Robin approach their 1,000th case together, Batman claimed that he wasn't worthy of the festivities in his honor. He felt that he had failed as Superman's partner, due to the latter's teaming with a mysterious new crime-fighter: Nightman. Superman suggested that Batman should try to solve the mystery of Nightman's identity. Robin further suggested that he could be "a sinister figure, pretending he's against crime to further some plot of his own!". Gordon gave him seven days to come through.
Over the next week, Batman works without sleep to determine Nightman's identity.
As it turns out, Nightman is in fact ... Bruce Wayne. Superman had hypnotized his friend into assuming the Nightman identity at night to give Batman a challenging case to solve, as thanks for all he's done.
Appearing in Superman and Batman: "The 1,000th Exploit of Superman and Batman!"
Featured Characters:
Supporting Characters:
Antagonists:
Other Characters:
- Ace Lanner (On a TV or computer screen)(Single appearance)
- Emilio Ruyez (Single appearance)
- Jay Lonn (Single appearance)
- Joker (In a photograph only)
Locations:
Items:
- Bat-Eye
- Batman Robot
- Green Kryptonite (Flashback only)
Vehicles:
Synopsis for Editors' Round Table: "The Mask of Fear"
This story is reprinted from House of Mystery #2.
Appearing in Editors' Round Table: "The Mask of Fear"
Featured Characters:
- Captain Hercule (Single appearance)
Supporting Characters:
- Monsieur Varon (Single appearance)
- Ringmaster Jacques (Single appearance)
- Major Marouf (Single appearance)
Other Characters:
- Rajah the tiger (Single appearance)
- Toto the gorilla (Single appearance)
Locations:
- Circus