Comic Title: Detective Comics #331
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: September 1964
On Sale Date: July 30, 1964 Copyright Date July 30, 1964
Source: Library of Congress, Periodicals 1964

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "Museum of Mixed-Up Men"
Pages: 24

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

Writer: Gardner F. Fox
Penciller: Carmine Infantino
Inker: Joe Giella

Reprinted In:
Batman:The Dynamic Duo Archives Vol. 1 HC (2003)
Showcase Presents the Elongated Man Vol. 1 TPB (2006)
Showcase Presents Batman Vol. 1 TPB (2006)
Tales of the Batman:Carmine Infantino HC (2014)

Feature Character(s)

• Batman (last appearance in World's Finest Comics #144; next appearance in Detective Comics #332)

Guest Star(s)

• Elongated Man (last appearance in Detective Comics #330; next appearance in Detective Comics #332)

Supporting Character(s)

• Robin (last appearance in World's Finest Comics #144; next appearance in Detective Comics #332)
• Commissioner Gordon (last appearance in Detective Comics #330; next appearance in Detective Comics #332)
• Harriet Cooper (last appearance in Detective Comics #328; next appearance in Batman #170)

Villain(s)

• Boss Barron and his gang (Harry named; no further appearances)
• A gang of jewel thieves (no further appearances)

Guest Appearance(s)

• Sue Dibny (last appearance in Detective Comics #330; next appearance in Detective Comics #332)

Other Character(s)

• David Moore and Crawford Lurie (vice-president of Gotham City Bank and a millionaire; no further appearances)

Synopsis:
While touring the Americana Wax Museum, Bruce Wayne has his photograph taken. The photographer is part of Boss Barron's gang, and the camera is really their new invention called an Electrofaciograph. The device removes Bruce's memory and exchanges his facial features with one of Barron's men for a period of twelve hours. After the exchange, Barron's man visits the bank and withdraws a half-million dollars from Bruce's account.

When Bruce recovers his memory, he helps Robin take down some jewel thieves, then investigates the museum. At the museum, Batman and Robin meet the Elongated Man, who is also investigating the mystery. The gang tries to use the Electrofaciograph on Batman to learn his secret identity, but Elongated Man steps in front of the device. With his memory removed, the Elongated Man helps Batman and Robin defeat the gang.