Comic Title: Adventure Comics #371
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: August 1968
On Sale Date: June 27, 1968 Copyright Date June 27, 1968
Source: Library of Congress, Periodicals 1968

Newsstand Date June 27, 1968
Source: Newsdealer Magazine, V23 #4

Newsstand Date June 27, 1968
Source: Comic Reader, #66

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

Title: "The Colossal Failure"
Pages: 11

Feature(s):
Legion of Super-Heroes (of Earth-1)

Writer: James Shooter
Penciller: Curt Swan
Inker: Jack Abel

Reprinted In:
Best of DC #24 (1982)
Legion of Super-Heroes Archives Vol. 8 HC (1998)
Showcase Presents:Legion of Super-Heroes Vol. 4 TPB (2010)
Legion of Super-Heroes:The Silver Age Omnibus Vol. 3 HC (2020)

Feature Character(s)

• Legion of Super-Heroes (last appearance in Adventure Comics #370; next appearance in Adventure Comics #372)
• Colossal Boy (last appearance in Superboy #147; next appearance in Adventure Comics #372)
• Saturn Girl (last appearance in Adventure Comics #368; next appearance in Adventure Comics #372)
• Brainiac 5 (last appearance in Adventure Comics #368; next appearance in Adventure Comics #372)
• Shrinking Violet (last appearance in Adventure Comics #368; next appearance in Adventure Comics #372)
• Superboy (last appearance in Superboy #149; next appearance in Adventure Comics #372)
• Ultra Boy (last appearance in Adventure Comics #370; next appearance in Adventure Comics #372)
• Bouncing Boy (last appearance in Adventure Comics #363; next appearance in Adventure Comics #372)
• Sun Boy (last appearance in Superboy #147; next appearance in Adventure Comics #372)

Supporting Character(s)

• Chemical King (Condo Arlik; a student at the Legion Academy; next appearance in Adventure Comics #372)
• Marte Allon (Colossal Boy's mother; first name not given in this story; next appearance in Adventure Comics #372)
• Wynn Allon (Colossal Boy's father; first name not given in this story; next appearance in Adventure Comics #372)

Villain(s)

• Gorko and Pollor (henchmen of Tarik the Mute; next appearance in Adventure Comics #372)
• A gang of Mohadian aqua-crooks (no further appearances)

Other Character(s)

• An unnamed instructor and students at the Legion Academy (no further appearances)

Comments:
Ultra Boy is revealed as the new Legion leader in this story.

This story continues in Adventure Comics #372.

Synopsis:
Colossal Boy is spending a quiet evening at home with his parents when two men claiming to represent Universe TV call on the Allons to interview them as part of a documentary on the Legion. When the men set up their equipment, however, it gives off rays that turn Mr. and Mrs. Allon to glass. They then explain that their criminal superiors have assigned them to learn the exact details of the Legion training and testing program. Since such knowledge is classified and known only to members of the selection board, the men give Gim two weeks to uncover the information, and teleport away with his parents as hostages.

Afraid to tell his comrades of his problem, Gim deliberately fails on a mission and submits to retraining in order to gain the needed information. Bouncing Boy, temporarily acting as instructor at the Legion Academy, suspects something wrong and, hoping to find clues to Gim's problem in the Allons' apartment, discovers a top-secret manual and illegal notes on the Legion training procedures.

Colossal Boy is charged with treason and spying and, still fearful for his parents' safety, he offers no defense at trial. Ultra Boy, as the new Legion leader, then expells him from the Legion, and crushed, he leaves in disgrace.