Comic Title: Action Comics #334
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: March 1966
On Sale Date: January 18, 1966 Newsstand Date January 18, 1966
Source: House Ad, Action Comics #335, Page 8

Copyright Date January 18, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Monthly (semi-monthly, March)
Cover Price: $0.25
Page Count: 80
Editor: Mort Weisinger

See Also: The Guide to DC Giants

Notes:
This issue is labeled 80-Page Giant #G-20.
This issue contains text features: "When Supergirl Met Jimmy Olsen", "Supergirl's Two Sets of Parents", "The Origin of Super-Horse", and a page from Action Comics #285 revealing Supergirl to the world.

Title: "The Three Super-Heroes"
Pages: 11

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

Writer: Jerry Siegel
Artist: Jim Mooney

Reprinted From:
Action Comics #267 (1960)

Feature Character(s)

• Supergirl (last appearance in Action Comics #268; next appearance in Action Comics #268)

Guest Star(s)

• Legion of Super-Heroes (last appearance in Legion of Super-Heroes #295; next appearance in Adventure Comics #282)
• Cosmic Boy (last appearance in Legion of Super-Heroes #295; next appearance in Adventure Comics #282)
• Saturn Girl (last appearance in Legion of Super-Heroes #295; next appearance in Adventure Comics #282)
• Lightning Lad (last appearance in Legion of Super-Heroes #295; next appearance in Adventure Comics #282)
• Chameleon Boy (next appearance in Adventure Comics #282)
• Invisible Kid (first appearance; last appearance in Superboy #176; next appearance in Adventure Comics #247)
• Colossal Boy (first appearance; last appearance in Legion of Super-Heroes #295; next appearance in Adventure Comics #282)

Guest Appearance(s)

• Superman (last appearance in Action Comics #268; next appearance in Superman's Pal, Jimmy Olsen #47)
• Star Boy (Thom Kallor; joins the Legion behind-the-scenes; last appearance in Legion of Super-Heroes #306; next appearance in Adventure Comics #282)

Other Character(s)

• An unnamed bus driver and some children (no further appearances)

Comments:
For some unexplained reason, the Legionnaires identify themselves as the sons and daughters of the original Legion members in this story. They also erroneously claim that all members inherited their powers from their extraterrestrial parents.

The Legion’s 18-year-old age limit for new members is first mentioned in this story.

When Supergirl is refused membership in this story, Cosmic Boy mentions that "someone else" has been admitted in her place. Contrary to the account in Secrets of the Legion of Super-Heroes #1, this new member is not Chameleon Boy, who is already a member in this story. By process of elimination, the member in question can only be Star Boy.

This reprint has two pages cut.

Synopsis:
In events paralleling (and from the Legion’s point-of-view, preceding) the initiation of Superboy, the Legion of Super-Heroes approaches Supergirl for membership, and brings her to the 30th century. There, she proves her worthiness by creating a trans-Earth tunnel that will lighten air traffic. Unfortunately, in doing so she encounters a piece of Red Kryptonite that temporarily transforms her into an adult. She is refused membership on the grounds that she now exceeds their 18-year-old age limit.

Heartbroken, Supergirl is forced to return home and wait for the transformation to end, and to wonder if she'’l have another chance at Legion membership.