Comic Title: World's Finest Comics #121
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1961
On Sale Date: September 7, 1961 Copyright Date September 7, 1961
Source: Library of Congress, Periodicals 1961


Frequency: Monthly, with the exception of January, April, July and October
Cover Price: $0.10
Page Count: 32
Editor: Jack Schiff

Title: "The Mirror Batman"
Pages: 13

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

Writer: Jerry Coleman
Artist: Jim Mooney

Reprinted In:
World's Finest Comics #206 (1971)
Showcase Presents:World's Finest Vol. 2 TPB (2008)
Batman & Superman in World's Finest Comics:The Silver Age Omnibus Vol. 2 HC (2019)

Feature Character(s)

• Superman (last appearance in Action Comics #281; next appearance in Superman's Girl Friend, Lois Lane #29)
• Batman (last appearance in Detective Comics #296; next appearance in Superman's Girl Friend, Lois Lane #29)

Supporting Character(s)

• Robin (last appearance in Detective Comics #296; next appearance in Detective Comics #297)

Villain(s)

• Three warehouse thieves (no further appearances)
• Xanu and his foe (two beings from the mirror dimension; no further appearances)

Synopsis:
While attempting to stop some crooks from robbing a warehouse, Batman accidently falls into a mirror which transports him to another dimension. Robin is unable to bring Batman back, so he contacts Superman for help. Batman emerges from the mirror, altered by it and given bizarre powers.

While Superman and Robin try to corral Batman, the thieves return to steal the mirror, locking in their hide-out safe. Batman is brought down by Superman, but can only be returned to normal by returning to the mirror’s dimension. Finding the mirror missing, Superman and Robin track down the thieves and recover the mirror.

The trio then enters the mirror and meet a strange being responsible for Batman’s transformation. Superman agrees to defeat Xanu, the being's enemy in return for returning the Caped Crusader to normal. Once the task is done, the trio return home, and Superman smashes the mirror.