Comic Title: Action Comics #263
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: April 1960
On Sale Date: March 1, 1960 Copyright Date March 1, 1960
Source: Library of Congress, Periodicals 1960

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

Title: "Supergirl's Darkest Day"
Pages: 12

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

Writer: Otto Binder
Artist: Jim Mooney

Reprinted In:
Action Comics #347 (1967)
Supergirl Archives Vol. 1 HC (2001)
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 (last appearance in Superman's Pal, Jimmy Olsen #44; next appearance in Action Comics #264)

Supporting Character(s)

• Miss Hart (last appearance in Action Comics #262; next appearance in Action Comics #264)
• Mr. Dixon (last appearance in Action Comics #262; next appearance in Action Comics #266)

Villain(s)

• Zoxxo (no further appearances)

Other Character(s)

• Prince Valzorr (given the name Johnny Blank; no further appearances)
• The Trents and the Peabodys (no further appearances)
• The King and Queen of Korvia (no further appearances)

Comments:
Supergirl’s skirt is colored red in this story.

Supergirl uses a Linda Lee robot stored in a hollow tree for the first time in this story.

Synopsis:
Supergirl rescues a boy from drowning. The boy has amnesia and is entrusted to the care of Midvale Orphanage. He does not speak English so Linda Lee is assigned to teach him. While secretly performing super deeds, Linda’s secret is uncovered by the boy. When Supergirl discovers that the boy can see in the dark, she realizes he is from another planet.

The boy is the prince of Korvia. His ship was damaged while fleeing his world. The boy is accused of killing his aunt and uncle. Supergirl decides to help the boy and travels with him back to Korvia.

At the boy’s trial, the method of the royal family’s death is shown. The couple was transporting in a special device and their pattern was lost. Supergirl uses her super speed to try many different patterns and restores the King and Queen. The prosecutor Zoxxo was responsible for their loss, and he is arrested. Supergirl returns to Earth where a Linda Lee robot double covered for her absence.