Comic Title: Action Comics #296
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: January 1963
On Sale Date: November 29, 1962 Newsstand Date November 29, 1962
Source: House Ad, Superman's Pal Jimmy Olsen #66, Page 21

Copyright Date November 29, 1962
Source: Library of Congress, Periodicals 1962

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The Girl Who Was Supergirl's Double"
Pages: 12

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

Writer: Leo Dorfman
Artist: Jim Mooney

Reprinted In:
Super DC Giant S-24 (1971)
Showcase Presents Supergirl Vol. 2 TPB (2009)
Supergirl:The Silver Age Omnibus Vol. 1 HC (2016)
Supergirl:The Silver Age Vol. 2 TPB (2018)

Feature Character(s)

• Supergirl (last appearance in Superman's Girl Friend, Lois Lane #38; next appearance in Action Comics #297)

Supporting Character(s)

• Edna Danvers (last appearance in Action Comics #295; next appearance in Action Comics #297)
• Dick Malverne (last appearance in Action Comics #295; next appearance in Action Comics #302)
• Lena Thorul (last appearance in Action Comics #295; next appearance in Action Comics #297)

Villain(s)

• Lex Luthor (last appearance in Action Comics #295; next appearance in Action Comics #297)
• Blackie and his partner (jewel thieves; no further appearances)
• The Giltedge butler (no further appearances)

Other Character(s)

• Mr. Giltedge and Clarissa (his daughter; no further appearances)
• Several guards (no further appearances)
• Various guests at a costume party (no further appearances)
• Dr. Malverne (last appearance in Action Comics #283; no further appearances)

Comments:
This story continues in the second story of Action Comics #297.

Synopsis:
Linda Lee and Dick Malverne attend a costume party. Their friend Lena Thorul shows up dresses as Supergirl. After an attempted robbery, Dick begins to believe Lena is Supergirl. After a series of coincidences, Dick believes his theory is confirmed. He confronts Lena who strangely admits that she is indeed the Girl of Steel.