Comic Title: Action Comics #301
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: June 1963
On Sale Date: April 25, 1963 Copyright Date April 25, 1963
Source: Library of Congress, Periodicals 1963

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

Title: "The Secret Identity of Super-Horse"
Pages: 12

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

Writer: Leo Dorfman
Artist: Jim Mooney

Reprinted In:
Adventure Comics #390 (1970)
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 Action Comics #300; next appearance in Adventure Comics #308)

Supporting Character(s)

• Comet (assumes the identity Bronco Bill; last appearance in Action Comics #300; next appearance in Adventure Comics #293)
• Lena Thorul (last appearance in Action Comics #300; next appearance in Action Comics #313)

Villain(s)

• Nomed (Prince Endor’s nephew; no further appearances)
• A criminal gang and their boss (no further appearances)

Guest Appearance(s)

• Superman (last appearance in Action Comics #300; next appearance in Superman's Girl Friend, Lois Lane #41)

Other Character(s)

• Prince Endor of Zerox and an advisor (no further appearances)

Comments:
Comet gains the ability to become human temporarily whenever a comet passes overhead.

This story is continued from the second story of Action Comics #300.

Synopsis:
Supergirl and Comet visit the planet Zerox to help Superman’s friend Prince Endor. Comet allows Endor to ride him in order to complete a ceremony which allows the prince to retain his rule. In appreciation for Comet’s help, Endor places a spell on the horse, which allows him to temporarily become human, when a comet passes.

When they return to Earth, Supergirl leaves Comet with some other horses. A comet passes by, transforming Super-Horse into a man. He assumes the identity of Bronco Bill, a rodeo star. He later meets Supergirl at the rodeo, but decides to keep his identity secret from her. Eventually the effect of the spell wears off, and Comet is returned to his horse form.