Comic Title: Detective Comics #223
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: September 1955
On Sale Date: July 28, 1955 Copyright Date July 26, 1955
Source: Library of Congress, Periodicals 1955
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.

Newsstand Date July 28, 1955
Source: Newsdealer Magazine, V10 #5

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

Title: "The Batman Dime-Museum"
Pages: 12

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

Penciller: Sheldon Moldoff
Inker: Stan Kaye

Reprinted In:
Batman:Secrets of the Batcave TPB (2007)

Feature Character(s)

• Batman (last appearance in Batman #94; next appearance in World's Finest Comics #78)

Supporting Character(s)

• Robin (last appearance in Batman #94; next appearance in World's Finest Comics #78)
• Commissioner Gordon (last appearance in Batman #94; next appearance in World's Finest Comics #78)
• Alfred Pennyworth (last appearance in Batman #94; next appearance in Detective Comics #225)

Villain(s)

• Big Jim Jarrel and his men (gangsters; no further appearances)
• Walter Burris and John Grane (a real-estate agent and a moving company owner; no further appearances)
• Whitey Weir (a robber; appears in flashback; no further appearances)

Other Character(s)

• Breezy Lane and Johnny (a showman and his son; no further appearances)

Synopsis:
A showman and his son open a Batman-Dime Museum in Gotham City using fake props. Commissioner Gordon wants to shut the museum down, but Batman himself does not object.

Big Jim Jarrel has been released from prison. He has learned that a cave exists below Wayne Manor, but does not know it is the Bat-Cave. He plans to use it for a hide-out by tunneling in from nearby.

Batman learns about Jarrel's plan, so he buys the Batman Dime-Museum from the showman. He and Robin then move the contents of the Bat-Cave into the museum, replacing the fake props. Batman also tries to gain evidence to convict Jarrel.

Jarrel and his men eventually tunnel into the Bat-Cave, but Batman has emptied it. Robin and Alfred have also diverted an underground river to flood the cave, making it useless to Jarrel. Batman gets the evidence to arrest the crooks. He then restores the Bat-Cave to normal and shuts down the museum.