Comic Title: Action Comics #279
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: August 1961
On Sale Date: June 29, 1961 Newsstand Date June 29, 1961
Source: House Ad, Superman Annual #3, Page 59

Copyright Date June 29, 1961
Source: Library of Congress, Periodicals 1961

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "Supergirl's Secret Enemy"
Pages: 12

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

Writer: Jerry Siegel
Artist: Jim Mooney

Reprinted In:
Action Comics #360 (1968)
Supergirl Archives Vol. 2 HC (2004)
Showcase Presents:Supergirl Vol. 1 TPB (2008)
Supergirl:The Silver Age Omnibus Vol. 1 HC (2016)
Supergirl:The Silver Age Vol. 1 TPB (2017)

Feature Character(s)

• Supergirl (takes the adopted name Linda Lee Danvers in this story; last appearance in Action Comics #278; next appearance in Action Comics #280)

Supporting Character(s)

• Superman (last appearance in Superman's Girl Friend, Lois Lane #27; next appearance in Superman's Pal, Jimmy Olsen #55)
• Fred Danvers (next appearance in Action Comics #282)
• Edna Danvers (next appearance in Action Comics #280)
• Streaky (last appearance in Action Comics #277; next appearance in Adventure Comics #293)
• Miss Hart (last appearance in Action Comics #271; next appearance in Action Comics #285)

Villain(s)

• Lesla-Lar (a Kandorian scientist; next appearance in Action Comics #280)
• Lex Luthor (last appearance in Superman #147; next appearance in Action Comics #280)

Other Character(s)

• Several Kandorians (no further appearances)

Cameo Appearance(s)

• Lori Lemaris (in flashback to the second story of Action Comics #278)
• Jerro (in flashback to the second story of Action Comics #278)
• Jor-El (in a Kandorian museum)
• Brainiac (in a Kandorian museum)
• Koko (in a Kandorian museum)

Synopsis:
Kandorian scientist and Supergirl look-a-like, Lesla-Lar, has used a special device to cause Supergirl’s powers to disappear. Without her powers, Supergirl, as Linda Lee, allows herself to be adopted by Fred and Edna Danvers. Superman constructs a hidden closet in her bedroom for mementos of her past deeds.

The jealous Lesla-Lar then switches places with the sleeping Linda Lee, allowing Linda to live her life within Kandor. Lesla then breaks Luthor out of jail and joins him in criminal activities as Supergirl. However, Linda’s memory begins to return when she sees the new Supergirl appear. Lesla returns each of them to their rightful places to preserve her secret, but plans to take Linda’s life again later.