Comic Title: Superman #21
Publisher: DC (Superman, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: Mar/Apr 1943
On Sale Date: December 30, 1942 Newsstand Date December 30, 1942
Source: House Ad, Action Comics #57, Page 16

Copyright Date January 2, 1943
Source: Library of Congress, Periodicals 1943
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: Bi-monthly
Cover Price: $0.10
Page Count: 64
Editor: Jack Schiff

Title: "The Robber Knight"
Pages: 13

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

Writer: Jerry Siegel
Artist: John Sikela

Reprinted In:
Superman Archives Vol. 6 HC (2003)
Superman:The Golden Age Omnibus Vol. 3 HC (2017)

Feature Character(s)

• Superman (last appearance in Superman #21; next appearance in Superman #21)

Supporting Character(s)

• Lois Lane (last appearance in Superman #21; next appearance in Superman #21)
• Perry White (last appearance in Superman #21; next appearance in Action Comics #58)
• Sergeant Casey (last appearance in Superman #21; next appearance in World's Finest Comics #9)

Villain(s)

• Sir Gauntlet (Casper Smythe; no further appearances)
• A gang of thugs (no further appearances)

Other Character(s)

• Mr. Lacey (a department store owner; no further appearances)
• Mr. Phelps (a manager; no further appearances)
• A store detective (no further appearances)
• Lucy Trent (a suspected thief; no further appearances)

Synopsis:
Lois Lane is arrested when she enters Lacey's department store wearing a stolen mink coat. Lois didn't know the coat was stolen, and her friend Lucy Trent comes forward to exonerate Lois. Lucy claims a man dressed as a knight gave her the coat.

Lois and Clark go undercover as store employees for Lacey's. When crooks appear, Superman goes into action. Then the knight makes an appearance. Superman stops him in his guise as Clark, revealing the knight as Casper Smythe, a disgruntled employee. Lucy is cleared, and Smythe is arrested.