Comic Title: Detective Comics #89
Publisher: DC (Detective Comics, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: July 1944
Approx. On Sale Date: May 26, 1944 Copyright Date May 23, 1944
Source: Library of Congress, Periodicals 1944
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: 56
Editor: Jack Schiff

Title: "Laboratory Loot"
Pages: 12

Feature(s):
Batman (of Earth-2)

Writer: Don Cameron
Artist: Dick Sprang

Reprinted In:
Batman Archives Vol. 4 HC (1998)
Batman:The Golden Age Omnibus Vol. 3 HC (2017)
Batman:The Golden Age Vol. 6 TPB (2020)

Feature Character(s)

• Batman (last appearance in World's Finest Comics #14; next appearance in Batman #24)

Supporting Character(s)

• Robin (last appearance in World's Finest Comics #14; next appearance in Batman #24)

Villain(s)

• Cavalier (real name Mortimer Drake revealed; last appearance in Batman #22; next appearance in Batman #26)
• Stinger Sloane and his henchmen (no further appearances)

Other Character(s)

• Dr. Helmar Helstrom (an inventor; no further appearances)

Synopsis:
Dr. Helmar Helstrom, an inventor and member of Bruce Wayne’s gentlemen’s club, tells the other club members about a special typewriter he has recently acquired. Helstrom is also working on a government project in his lab, which is guarded by Batman.

That night Helstrom’s lab is broken in to. Batman receives the alarm and arrives to find that the Cavalier is stealing the typewriter. While they fight, more crooks arrive to steal Helstrom’s project. Batman defeats them, but Cavalier escapes with the typewriter.

Batman suspects the Cavalier is secretly a member of the gentlemen’s club. He spots a stain on one man’s hand which matches the Cavalier. When next they meet Batman reveals that the Cavalier is really Mortimer Drake. Drake leaves town, telling Batman he will be back soon using another identity.