Comic Title: Action Comics #300
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: May 1963
On Sale Date: March 28, 1963 Newsstand Date March 28, 1963
Source: House Ad, Superman #161, Page 16

Copyright Date March 28, 1963
Source: Library of Congress, Periodicals 1963

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

Title: "The Return of Super-Horse"
Pages: 11

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

Writer: Leo Dorfman
Artist: Jim Mooney

Reprinted In:
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 #161; next appearance in Action Comics #301)

Supporting Character(s)

• Fred Danvers (last appearance in Action Comics #299; next appearance in Action Comics #302)
• Edna Danvers (last appearance in Action Comics #299; next appearance in Action Comics #302)
• Lena Thorul (last appearance in Action Comics #298; next appearance in Action Comics #301)
• Comet (last appearance in Action Comics #294; next appearance in Action Comics #301)

Villain(s)

• Stacy and Grimm (two bank robbers; no further appearances)

Guest Appearance(s)

• Superman (voice only; last appearance in Action Comics #300; next appearance in Action Comics #301)

Other Character(s)

• Liz Gaynor (last appearance in Action Comics #294; no further appearances)
• Two farmers and Bonnie (their daughter; no further appearances)

Cameo Appearance(s)

• Lex Luthor (in Supergirl’s dream)
• Circe (in flashback to Comet’s origin)

Comments:
Comet regains his memory in this story.

This story continues in the second story of Action Comics #301.

Synopsis:
Supergirl dreams of her horse Comet and learns that he has run away from his owner Liz Gaynor. Wandering the countryside, Comet is captured by crooks, escapes, then rescues a young girl. When he sees Supergirl his memory returns, and he assists the Maid of Steel on a short mission, before being summoned to Superman’s Fortress for a special assignment.