Comic Title: Detective Comics #239
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: January 1957
Approx. On Sale Date: November 27, 1956 Copyright Date November 25, 1956
Source: Library of Congress, Periodicals 1956
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Jack Schiff

Title: "Batman's Robot Twin"
Pages: 12

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

Penciller: Sheldon Moldoff
Inker: Charles Paris

Reprinted In:
Batman:The Silver Age Omnibus Vol. 1 HC (2023)

Feature Character(s)

• Batman (last appearance in Detective Comics #238; next appearance in World's Finest Comics #86)

Supporting Character(s)

• Robin (last appearance in Detective Comics #238; next appearance in World's Finest Comics #86)
• Commissioner Gordon (last appearance in Batman #104; next appearance in World's Finest Comics #86)
• Alfred Pennyworth (last appearance in Batman #104; next appearance in Batman #105)

Villain(s)

• Dr. Dall and his henchmen (no further appearances)

Other Character(s)

• Professor Carden and a robot twin (no further appearances)

Synopsis:
Inventor Professor Carden creates a robot twin that can be programmed with the brain waves of any person. Dr. Dall, a visiting scientist, recommends that Batman's brain waves be used to program the robot. Batman agrees to the experiment, then must leave to deal with an emergency. While Batman is away Dr. Dall steals the robot.

Since the robot is programmed with all of Batman's knowledge, Dr. Dall tries to make it reveal Batman's secret identity. However, the robot is compelled to keep the secret. Instead Dall sends the robot to capture Batman. Batman outwits the robot the first time, and when it tries again, he tricks it into an electric shock which resets its program. Batman then captures Dall and his henchmen.