Comic Title: Action Comics #302
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: July 1963
On Sale Date: May 29, 1963 Newsstand Date May 29, 1963
Source: House Ad, Superboy #106, Page 19

Copyright Date May 29, 1963
Source: Library of Congress, Periodicals 1963

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

Title: "The Day Super-Horse Went Wild"
Pages: 13

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's Pal, Jimmy Olsen #70; next appearance in Action Comics #303)

Supporting Character(s)

• Comet (last appearance in Adventure Comics #293; next appearance in Action Comics #304)
• Jerro (last appearance in Action Comics #290; next appearance in Action Comics #307)
• Dick Malverne (last appearance in Action Comics #296; next appearance in Action Comics #304)
• Fred Danvers (last appearance in Action Comics #300; next appearance in Action Comics #303)
• Edna Danvers (last appearance in Action Comics #300; next appearance in Action Comics #303)
• Lori Lemaris (last appearance in Superman's Pal, Jimmy Olsen #70; next appearance in Action Comics #303)

Villain(s)

• Vostar (an Atlantean criminal; next appearance in Superman's Pal, Jimmy Olsen #73)
• Gorbin and Finney (owners of a sea circus; no further appearances)

Cameo Appearance(s)

• Lex Luthor (in a photograph)
• Circe (in flashback to Comet’s origin)

Comments:
This story shows that the waters above Atlantis, known as Zone X, are protected by the United Nations.

Synopsis:
After rescuing Lori Lemaris and Jerro from poachers, Supergirl and Comet tour Atlantis. There they incur the wrath of an Atlantean criminal Vostar. Vostar uses a telepathy helmet to gain control of Comet and set him on a path of destruction. In doing so Comet is sent back in time, where he encounters Halley’s Comet. Upon returning to the present he is transformed into the humanoid form, Biron. Then he warns Supergirl about Vostar. She is able to capture the criminal before he can force Comet to continue his rampage.